Astronomy:Timeline of astronomy

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Short description: List of important events in the history of astronomy

This is a timeline of astronomy. It covers ancient, medieval, Renaissance-era, and finally modern astronomy.

Prehistoric Period

7500 BCE

Neolithic inhabitants constructed Nabta Playa megalithic structures, in Aswan located in Upper Egypt.[1] These structures served to coordinate astronomical observations, religious practices and alignment with solar patterns and annual flooding cycles. These practices have been linked with the emergence of cosmology in Old Kingdom Egypt.[2]

Antiquity

750 BC

585 BC

467 BC

Anaxagoras produced a correct explanation for eclipses and then described the Sun as a fiery mass larger than the Peloponnese, as well as attempting to explain rainbows and meteors. He was the first to explain that the Moon shines due to reflected light from the Sun.[3][4][5]

400 BC

Around this date, Babylonians use the zodiac to divide the heavens sexagesimally into twelve equal segments of thirty degrees each, the better to record and communicate information about the position of celestial bodies.[6]

387 BC

Plato, a Greek philosopher, founds a school (the Platonic Academy) that will influence the next 2000 years. Borrowing and expanding from Pythagoreanism, it promotes the idea that everything in the universe moves in harmony and that the Sun, Moon, and planets move around Earth in perfect circles.[7]

380 BC

Aristotle, a Greek polymath, described motion of physical objects based on their affinity with one of four classical elements: earth, water, air, or fire.[8]

350 BC

The astronomer Shi Shen is believed to have cataloged 809 stars in 122 constellations, and he also made the earliest known observation of sunspots.[9]

270 BC

Aristarchus of Samos proposes heliocentrism as an alternative to the Earth-centered universe. His heliocentric model places the Sun at its center, with Earth as just one planet orbiting it. However, there were only a few people who took the theory seriously.

240 BC

The earliest recorded sighting of Halley's Comet is made by Chinese astronomers. Their records of the comet's movement allow astronomers today to predict accurately how the comet's orbit changes over the centuries.

170 BC

Hipparchus incidentally discovered of the precession of the equinoxes.

70 BC

Vitruvius explains that an object’s fall speed depends on their specific gravity.[10][11]

Middle ages

The Hindu cosmological time cycles explained in the Surya Siddhanta, give the average length of the sidereal year (the length of the Earth's revolution around the Sun) as 365.2563627 days, which is only 1.4 seconds longer than the modern value of 365.256363004 days.[12] This remains the most accurate estimate for the length of the sidereal year anywhere in the world for over a thousand years.

Indian mathematician-astronomer Aryabhata, in his Aryabhatiya, first explains the elliptical model of the planets, where the planets spin on their axis and follow elliptical orbits, the Sun and the Moon revolve around the Earth in epicycles. He also writes that the planets and the Moon do not have their own light but reflect the light of the Sun and that the Earth rotates on its axis causing day and night and also that the Sun rotates around the Earth causing years.[13]

Indian mathematician-astronomer Brahmagupta, in his Brāhmasphuṭasiddhānta, first recognizes gravity as a force of attraction. He gives methods for calculations of the motions and places of various planets, their rising and setting, conjunctions, and calculations of the solar and lunar eclipses.

Muḥammad ibn Ibrāhīm al-Fazārī and Yaʿqūb ibn Ṭāriq translate the Surya Siddhanta and Brahmasphutasiddhanta, and compile them as the Zij al-Sindhind, the first Zij treatise.[14]

The first major Arabic work of astronomy is the Zij al-Sindh by Muhammad ibn Musa al-Khwarizmi. The work contains tables for the movements of the Sun, the Moon, and the five planets known at the time. The work is significant as it introduced Ptolemaic concepts into Islamic sciences. This work also marks the turning point in Arabic astronomy. Hitherto, Arabic astronomers had adopted a primarily research approach to the field, translating works of others and learning already discovered knowledge. Al-Khwarizmi's work marked the beginning of nontraditional methods of study and calculations.[15]

al-Farghani wrote Kitab fi Jawani ("A compendium of the science of stars"). The book primarily gave a summary of Ptolemic cosmography. However, it also corrected Ptolemy based on findings of earlier Arab astronomers. Al-Farghani gave revised values for the obliquity of the ecliptic, the precessional movement of the apogees of the Sun and the Moon, and the circumference of the Earth. The books were widely circulated through the Muslim world and even translated into Latin.[16]

The earliest surviving astrolabe is constructed by astronomer Nastulus.[17]

Al-Biruni discussed the Indian geocentric theories of Aryabhata, Brahmagupta and Varāhamihira in his Ta'rikh al-Hind (Indica in Latin). Biruni stated that the followers of Aryabhata consider the Earth to be at the center. In fact, Biruni casually stated that this does not create any mathematical problems.[18]

Al-Sijzi, a contemporary of Al-Biruni, defended the theory that Earth rotates on its axis.

Chinese astronomers record the sudden appearance of a bright star. Native-American rock carvings also show the brilliant star close to the Moon. This star is the Crab supernova exploding.

Abu Ubayd al-Juzjani published the Tarik al-Aflak. In his work, he indicated the so-called "equant" problem of the Ptolemic model. Al-Juzjani even proposed a solution to the problem. In al-Andalus, the anonymous work al-Istidrak ala Batlamyus (meaning "Recapitulation regarding Ptolemy"), included a list of objections to the Ptolemic astronomy.

One of the most important works in the period was Al-Shukuk ala Batlamyus ("Doubts on Ptolemy"). In this, the author summed up the inconsistencies of the Ptolemic models. Many astronomers took up the challenge posed in this work, namely to develop alternate models that evaded such errors.

Islamic and Indian astronomical works (including Aryabhatiya and Brahma-Sphuta-Siddhanta) are translated into Latin in Córdoba, Spain in 1126, introducing European astronomers to Islamic and Indian astronomy.

Indian mathematician-astronomer Bhāskara II, in his Siddhanta Shiromani, calculates the longitudes and latitudes of the planets, lunar and solar eclipses, risings and settings, the Moon's lunar crescent, syzygies, and conjunctions of the planets with each other and with the fixed stars, and explains the three problems of diurnal rotation. He also calculates the planetary mean motion, ellipses, first visibilities of the planets, the lunar crescent, the seasons, and the length of the Earth's revolution around the Sun to 9 decimal places.

Nur ad-Din al-Bitruji proposed an alternative geocentric system to Ptolemy's. He also declared the Ptolemaic system as mathematical, and not physical. His alternative system spread through most of Europe during the 13th century, with debates and refutations of his ideas continued to the 16th century.[19][20]

Mu'ayyad al-Din al-Urdi develops the Urdi lemma, which is later used in the Copernican heliocentric model.

Nasir al-Din al-Tusi resolved significant problems in the Ptolemaic system by developing the Tusi-couple as an alternative to the physically problematic equant introduced by Ptolemy.[21] His Tusi-couple is later used in the Copernican model.

Tusi's student Qutb al-Din al-Shirazi, in his The Limit of Accomplishment concerning Knowledge of the Heavens, discusses the possibility of heliocentrism.


Ibn al-Shatir (1304–1375), in his A Final Inquiry Concerning the Rectification of Planetary Theory, eliminated the need for an equant by introducing an extra epicycle, departing from the Ptolemaic system in a way very similar to what Copernicus later also did. Ibn al-Shatir proposed a system that was only approximately geocentric, rather than exactly so, having demonstrated trigonometrically that the Earth was not the exact center of the universe. His rectification is later used in the Copernican model.

Renaissance and Age of Enlightenment

16th century

17th century

18th century

1705

1750

1781

1784

19th century

1800

1801

1814

1838

1843

1845

1846

1868

1872

1895

20th century

1901

1906

1910

1912

Henrietta Swan Leavitt discovers the period-luminosity relation for Cepheid variables, where the intrinsic brightness of a star is proportional to its luminosity oscillation period. It opened a whole new branch of possibilities of measuring distances on the universe, and this discovery was the basis for the work done by Edwin Hubble on extragalactic astronomy.

1916

German physicist Karl Schwarzschild uses Albert Einstein's theory of general relativity to lay the groundwork for black hole theory. He suggests that if any star collapse to a certain size or smaller, its gravity will be so strong that no form of radiation will escape from it.

1923

Edwin Hubble discovers a Cepheid variable star in the "Andromeda Nebula" and proves that Andromeda and other nebulas are galaxies far beyond our own. By 1925, he produces a classification system for galaxies.

1925

Cecilia Payne-Gaposchkin discovers that hydrogen is the most abundant element in the Sun's atmosphere, and accordingly, the most abundant element in the universe by relating the spectral classes of stars to their actual temperatures and by applying the ionization theory developed by Indian physicist Meghnad Saha. This opens the path for the study of stellar atmospheres and chemical abundances, contributing to understand the chemical evolution of the universe.

1926

Robert Goddard launches the first rocket powered by liquid fuel. He also demonstrates that a rocket can work in a vacuum. His later rockets break the sound barrier for the first time.

1929

Edwin Hubble discovered that the universe is expanding and that the farther away a galaxy is, the faster it is moving away from us. Two years later, Georges Lemaître suggests that the expansion can be traced to an initial "Big Bang".

1930

By applying new ideas from subatomic physics, Subrahmanyan Chandrasekhar predicts that the atoms in a white dwarf star of more than 1.44 solar masses will disintegrate, causing the star to collapse violently. In 1933, Walter Baade and Fritz Zwicky describe the neutron star that results from this collapse, causing a supernova explosion.

Clyde Tombaugh discovers the dwarf planet Pluto at the Lowell Observatory in Flagstaff, Arizona. The object is so faint and moving so slowly that he has to compare photos taken several nights apart.

1932

Karl Jansky detects the first radio waves coming from space. In 1942, radio waves from the Sun are detected. Seven years later radio astronomers identify the first distant source – the Crab Nebula, and the galaxies Centaurus A and M87.

1938

German physicist Hans Bethe explains how stars generate energy. He outlines a series of nuclear fusion reactions that turn hydrogen into helium and release enormous amounts of energy in a star's core. These reactions use the star's hydrogen very slowly, allowing it to burn for billions of years.

1944

A team of German scientists led by Wernher von Braun develops the V-2, the first rocket-powered ballistic missile. Scientists and engineers from Braun's team were captured at the end of World War II and drafted into the American and Soviet rocket programs.

1947

The US sent up the first animals in space although not into orbit, through a V-2 rocket launched from White Sands Missile Range, New Mexico. The animals were fruit flies.[22][23][24]

1948

The largest telescope in the world, with a 5.08m (200 in) mirror, is completed at Palomar Mountain in California. At the time, the telescope pushes single-mirror telescope technology to its limits – large mirrors tend to bend under their own weight.

1957

The Soviet Union launches the first artificial satellite, Sputnik 1, into orbit, beginning the space age. The US launches its first satellite, Explorer 1, four months later.

1958

July 29 marks the beginning of the NASA (National Aeronautics and Space Administration), agency newly created by the United States to catch up with Soviet space technologies. It absorbs all research centers and staffs of the NACA (National Advisory Committee for Aeronautics), an organization founded in 1915.

1959

The USSR and the US both launch probes to the Moon, but NASA's Pioneer probes all failed. The Soviet Luna program was more successful. Luna 2 crash-lands on the Moon's surface in September, and Luna 3 returns the first pictures of the Moon's farside in October.

1960

Cornell University astronomer Frank Drake performed the first modern SETI experiment, named "Project Ozma", after the Queen of Oz in L. Frank Baum's fantasy books.[25]

1961

As part of NASA's Mercury-Redstone 2 mission, the chimpanzee Ham becomes the first Hominidae in space. Yuri Gagarin becomes the first person to orbit Earth in April. NASA astronaut Alan Shepard becomes the first American in space a month later, but does not go into orbit.[26]

1962

John Glenn becomes the first American to orbit Earth. Mariner 2 becomes the first probe to reach another planet, flying past Venus in December. NASA follows this with the successful Mariner 4 mission to Mars in 1965, both the US and the USSR send many more probes to planets through the rest of the 1960s and 1970s.

1963

Dutch-American astronomer Maarten Schmidt measures the spectra of quasars, the mysterious star-like radio sources discovered in 1960. He establishes that quasars are active galaxies, and among the most distant objects in the universe.

1964

Nikolai Kardashev makes the Kardashev Scale to measure the power of civilizations.

1965

Arno Penzias and Robert Wilson announce the discovery of a weak radio signal coming from all parts of the sky. Scientists figure out that this must be emitted by an object at a temperature of −270 °C. Soon it is recognized as the remnant of the very hot radiation from the Big Bang that created the universe 13 billion years ago, see Cosmic microwave background.

1966

Soviet Luna 9 probe makes the first successful soft landing on the Moon in January, while the US lands the far more complex Surveyor missions, which follows up to NASA's Ranger series of crash-landers, scout sites for possible crewed landings.

1967

Jocelyn Bell Burnell and Antony Hewish detected the first pulsar, an object emitting regular pulses of radio waves. Pulsars are eventually recognized as rapidly spinning neutron stars with intense magnetic fields - the remains of a supernova explosion.

1968

NASA's Apollo 8 mission becomes the first human spaceflight mission to enter the gravitational influence of another celestial body and to orbit it.

1969

The US wins the race for the Moon as Neil Armstrong and Buzz Aldrin step onto the lunar surface on July 20. Apollo 11 is followed by five further landing missions, three carrying a sophisticated Lunar Roving Vehicle.

1970

The Uhuru satellite, designed to map the sky at X-ray wavelengths, is launched by NASA. The existence of X-rays from the Sun and a few other stars has already been found using rocket-launched experiments, but Uhuru charts more than 300 X-ray sources, including several possible black holes.

1971

The USSR launches its first space station Salyut 1 into orbit. It is followed by a series of stations, culminating with Mir in 1986. A permanent platform in orbit allows cosmonauts to carry out serious research and to set a series of new duration records for spaceflight.

1972

Charles Thomas Bolton was the first astronomer to present irrefutable evidence of the existence of a black hole.

1975

The Soviet probe Venera 9 lands on the surface of Venus and sends back the first picture of its surface. The first probe to land on another planet, Venera 7 in 1970, had no camera. Both break down within an hour in the hostile atmosphere.

1976

NASA's Viking 1 and Viking 2 space probes arrive at Mars. Each Viking mission consists of an orbiter, which photographs the planet from above, and a lander, which touches down on the surface, analyzes the rocks, and searches unsuccessfully for life.

1977

On August 20 the Voyager 2 space probe launched by NASA to study the Jovian system, Saturnian system, Uranian system, Neptunian system, the Kuiper belt, the heliosphere and the interstellar space.

On September 5 The Voyager 1 space probe launched by NASA to study the Jovian system, Saturnian system and the interstellar medium.

1981

Space Shuttle Columbia, the first of NASA's reusable Space Shuttles, makes its maiden flight, ten years in development, the Shuttle will make space travel routine and eventually open the path for a new International Space Station.

1983

The first infrared astronomy satellite, IRAS, is launched. It must be cooled to extremely low temperatures with liquid helium, and it operates for only 300 days before the supply of helium is exhausted. During this time it completes an infrared survey of 98% of the sky.

1986

NASA's spaceflight program comes to a halt when Space Shuttle Challenger explodes shortly after launch. A thorough inquiry and modifications to the rest of the fleet kept the shuttles on the ground for nearly three years.

The returning Halley's Comet is met by a fleet of five probes from the USSR, Japan, and Europe. The most ambitious is the European Space Agency's Giotto spacecraft, which flies through the comet's coma and photographs the nucleus.

1989

The Magellan probe, launched by NASA, arrives at Venus and spends three years mapping the planet with radar. Magellan is the first in a new wave of probes that include Galileo, which arrives at Jupiter in 1995, and Cassini which arrives at Saturn in 2004.

1990

The Hubble Space Telescope, the first large optical telescope in orbit, is launched using the Space Shuttle, but astronomers soon discovered that it is crippled by a problem with its mirror. A complex repair mission in 1993 allows the telescope to start producing spectacular images of distant stars, nebulae, and galaxies.

1992

The Cosmic Background Explorer satellite produces a detailed map of the background radiation remaining from the Big Bang. The map shows "ripples", caused by slight variations in the density of the early universe – the seeds of galaxies and galaxy clusters.

The 10-meter Keck telescope on Mauna Kea, Hawaii, is completed. The first revolutionary new wave of telescopes, the Keck's main mirror is made of 36 six-sided segments, with computers to control their alignment. New optical telescopes also make use of interferometry – improving resolution by combining images from separate telescopes.

1995

The first exoplanet, 51 Pegasi b, is discovered by Michel Mayor and Didier Queloz.

1998

Construction work on a huge new space station named ISS has begun. A joint venture between many countries, including former space rivals Russia and the US.

The accelerated expansion was discovered during 1998, by two independent projects, the Supernova Cosmology Project and the High-Z Supernova Search Team, which both used distant type Ia supernovae to measure the acceleration.

21st century

2003

Space Shuttle Columbia disintegrates upon reentry into Earth's atmosphere

2005

Mike Brown and his team discovered Eris a large body in the outer Solar System[27] which was temporarily named as (2003) UB313. Initially, it appeared larger than Pluto and was called the tenth planet.[28]

2006

International Astronomical Union (IAU) adopted a new definition of planet. A new distinct class of objects called dwarf planets was also decided. Pluto was redefined as a dwarf planet along with Ceres and Eris, formerly known as (2003) UB313. Eris was named after the IAU General Assembly in 2006.[29][30]

2008

2008 TC3 becomes the first Earth-impacting meteoroid spotted and tracked prior to impact.

2012

(May 2) First visual proof of the existence of black holes is published. Suvi Gezari's team in Johns Hopkins University, using the Hawaiian telescope Pan-STARRS 1, record images of a supermassive black hole 2.7 million light-years away that is swallowing a red giant.[31]

2013

In October 2013, the first extrasolar asteroid is detected around white dwarf star GD 61. It is also the first detected extrasolar body which contains water in liquid or solid form.[32][33][34]

2015

On July 14, with the successful encounter of Pluto by NASA's New Horizons spacecraft, the United States became the first nation to explore all of the nine major planets recognized in 1981. Later on September 14, LIGO was the first to directly detect gravitational waves.[35]

2016

Exoplanet Proxima Centauri b is discovered around Proxima Centauri by the European Southern Observatory, making it the closest known exoplanet to the Solar System as of 2016.

2017

In August 2017, a neutron star collision that occurred in the galaxy NGC 4993 produced the gravitational wave signal GW170817, which was observed by the LIGO/Virgo collaboration. After 1.7 seconds, it was observed as the gamma-ray burst GRB 170817A by the Fermi Gamma-ray Space Telescope and INTEGRAL, and its optical counterpart SSS17a was detected 11 hours later at the Las Campanas Observatory. Further optical observations e.g. by the Hubble Space Telescope and the Dark Energy Camera, ultraviolet observations by the Swift Gamma-Ray Burst Mission, X-ray observations by the Chandra X-ray Observatory and radio observations by the Karl G. Jansky Very Large Array complemented the detection. This was the first instance of a gravitational wave event that was observed to have a simultaneous electromagnetic signal, thereby marking a significant breakthrough for multi-messenger astronomy.[36] Non-observation of neutrinos is attributed to the jets being strongly off-axis.[37]

2019

China's Chang'e 4 became the first spacecraft to perform a soft landing on the far side of the Moon.

In April 2019, the Event Horizon Telescope Collaboration obtained the first image of a black hole which was at the center of galaxy M87, providing more evidence for the existence of supermassive black holes in accordance with general relativity.[38]

India launched its second lunar probe called Chandrayaan-2 with an orbiter that was successful and a lander called Vikram along with a rover called Pragyan which failed just 2.1 km above the lunar south pole.

2020

NASA launches Mars 2020 to Mars with a Mars rover and a small helicopter that was named Perseverance and Ingenuity by seventh grader Alexander Mather and eleventh grader Vaneeza Rupani respectively in a naming contest.[39][40] First human orbital spaceflight launched by a private company occurred when SpaceX Demo-2 carrying astronauts Bob Behnken and Doug Hurley was launched to the International Space Station.

References

  1. ↑ Ehret, Christopher (20 June 2023) (in en). Ancient Africa: A Global History, to 300 CE. Princeton University Press. pp. 107-110. ISBN 978-0-691-24410-5. https://www.google.co.uk/books/edition/Ancient_Africa/S5KjEAAAQBAJ?hl=en&gbpv=1&dq=christopher+ehret+nabta+playa&printsec=frontcover. 
  2. ↑ Ehret, Christopher (20 June 2023) (in en). Ancient Africa: A Global History, to 300 CE. Princeton University Press. pp. 107-110. ISBN 978-0-691-24410-5. https://www.google.co.uk/books/edition/Ancient_Africa/S5KjEAAAQBAJ?hl=en&gbpv=1&dq=christopher+ehret+nabta+playa&printsec=frontcover. 
  3. ↑ Russell, Bertrand (2008). History of Western Philosophy. Simon and Schuster. p. 213. ISBN 978-0-6712-0158-6. https://books.google.com/books?id=iQZ6Xk9VdtAC&dq=anaxagoras+discovered+that+the+moon+shines+by+reflected+light,+and+gave+the+right+theory+of+eclipses&pg=PA213. Retrieved 1 June 2015. 
  4. ↑ Tassoul, Jean-Louis; Tassoul, Monique (2014). A Concise History of Solar and Stellar Physics. Princeton University Press. p. 8. ISBN 978-0-6911-6592-9. https://books.google.com/books?id=PS7aBAAAQBAJ&q=%22According%20to%20Anaxagoras%2C%20the%20sun%20was%22%20%22rather%20larger%20than%20the%20Peloponnese%22. Retrieved 1 June 2015. 
  5. ↑ Burnet J. (1892) Early Greek Philosophy A. & C. Black, London, OCLC 4365382, and subsequent editions, 2003 edition published by Kessinger, Whitefish, Montana, ISBN 0-7661-2826-1
  6. ↑ Britton, John P. (2010), "Studies in Babylonian lunar theory: part III. The introduction of the uniform zodiac", Archive for History of Exact Sciences 64 (6): 617–663, doi:10.1007/S00407-010-0064-Z, "[T]he zodiac was introduced between −408 and −397 and probably within a very few years of −400." 
  7. ↑ Australia Telescope National Facility. Classical Astronomy. https://web.archive.org/web/20140314115151/http://www.atnf.csiro.au/outreach//education/senior/cosmicengine/classicalastronomy.html
  8. ↑ Aristotle. Physics: Book VIII. https://classics.mit.edu/Aristotle/physics.8.viii.html. Retrieved 7 February 2025. 
  9. ↑ Temple, R.(1988). The Observation of sunspots. The UNESCO Courier. XLI,10. Retrieved from https://unesdoc.unesco.org/ark:/48223/pf0000081672
  10. ↑ "Vitruvius, On Architecture 7.8.3". https://lexundria.com/vitr/7.8.3/cf. 
  11. ↑ Vitruvius, Marcus Pollio (1914). "7". in Alfred A. Howard. De Architectura libri decem. VII. Herbert Langford Warren, Nelson Robinson (illus), Morris Hicky Morgan. Harvard University, Cambridge: Harvard University Press. p. 215. http://www.gutenberg.org/files/20239/20239-h/29239-h.htm#Page_215. 
  12. ↑ White, M.J.. "Sidereal, tropical, and anomalistic years". http://www.public.asu.edu/~mjwhite/Sidereal%20and%20tropical%20years.pdf. 
  13. ↑ *Sen, Amartya (2005). The Argumentative Indian. Allen Lane. p. 29. ISBN 978-0-7139-9687-6. 
  14. ↑ Kennedy, Edward S. (1956), "A Survey of Islamic Astronomical Tables", Transactions of the American Philosophical Society 46 (2): 123–177, doi:10.2307/1005726, https://babel.hathitrust.org/cgi/imgsrv/download/pdf?id=mdp.39076006359272;orient=0;size=100;seq=5;attachment=0 
  15. ↑ Dallal (1999), pg. 163
  16. ↑ Dallal (1999), pg. 164
  17. ↑ Rius, Mònica (2007). "Nasṭūlus: Muḥammad ibn ʿAbd Allāh". in Thomas Hockey. The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 822–3. ISBN 9780387310220. http://islamsci.mcgill.ca/RASI/BEA/Nastulus_BEA.htm. 
  18. ↑ Saliba (1999).
  19. ↑ Samsó, Julio (1970–80). "Al-Bitruji Al-Ishbili, Abu Ishaq". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. ISBN 978-0-684-10114-9. http://www.encyclopedia.com/doc/1G2-2830904829.html. 
  20. ↑ Samsó, Julio (2007). "Biṭrūjī: Nūr al-Dīn Abū Isḥāq [Abū Jaʿfar] Ibrāhīm ibn Yūsuf al-Biṭrūjī". in Thomas Hockey. The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 133–4. ISBN 978-0-387-31022-0. http://islamsci.mcgill.ca/RASI/BEA/Bitruji_BEA.htm.  (PDF version)
  21. ↑ M. Gill (2005). Was Muslim Astronomy the Harbinger of Copernicanism?
  22. ↑ UPPER AIR ROCKET SUMMARY V-2 NO. 20 . postwarv2.com
  23. ↑ "The Beginnings of Research in Space Biology at the Air Force Missile Development Center, 1946–1952". History of Research in Space Biology and Biodynamics. NASA. https://history.nasa.gov/afspbio/part1.htm. 
  24. ↑ "V-2 Firing Tables". White Sands Missile Range. http://www.wsmr.army.mil/pao/FactSheets/V2/v-2tab.htm. 
  25. ↑ "Science: Project Ozma," Time, April 18, 1960 (web version accessed 17 October 2017)
  26. ↑ Swenson, Loyd S. Jr.; Grimwood, James M.; Alexander, Charles C. (1966). This New Ocean: A History of Project Mercury. The NASA History Series. Washington, DC: National Aeronautics and Space Administration. NASA SP-4201. OCLC 569889. http://www.hq.nasa.gov/office/pao/History/SP-4201/cover.htm. Retrieved June 28, 2007. 
  27. ↑ "The Discovery of Eris". Space Daily. 2 March 2007. http://www.spacedaily.com/reports/The_Discovery_Of_Eris_999.html. 
  28. ↑ "Object Bigger than Pluto Discovered, Called 10th Planet". Space.com. 29 July 2005. http://www.space.com/1373-object-bigger-pluto-discovered-called-10th-planet.html. 
  29. ↑ "Pluto and the Developing Landscape of Our Solar System". International Astronomical Union. https://www.iau.org/public/themes/pluto/. 
  30. ↑ "Planet community in a spin". ABC. 25 August 2006. http://www.abc.net.au/science/news/stories/s1723907.htm. 
  31. ↑ "Big Gulp: Flaring Galaxy Marks the Messy Demise of a Star in a Supermassive Black Hole" Scientific American
  32. ↑ "Scientists discover water-rich asteroid orbiting dead star GD 61 outside our solar system". Pentagonpost.com. http://www.pentagonpost.com/scientists-discover-waterrich-asteroid-orbiting-dead-star-gd-61-solar-system/83413157. 
  33. ↑ "Watery asteroid discovered in dying star points to habitable exoplanets". Phys.org. http://phys.org/news/2013-10-watery-asteroid-dying-star-habitable.html. 
  34. ↑ Mack, Eric (2011-10-17). "Newly spotted wet asteroids point to far-flung Earth-like planets | Crave - CNET". News.cnet.com. http://news.cnet.com/8301-17938_105-57607077-1/newly-spotted-wet-asteroids-point-to-far-flung-earth-like-planets/. 
  35. ↑ Castelvecchi, Davide; Witze, Witze (February 11, 2016). "Einstein's gravitational waves found at last". Nature News. doi:10.1038/nature.2016.19361. http://www.nature.com/news/einstein-s-gravitational-waves-found-at-last-1.19361. Retrieved 2016-02-11. 
  36. ↑ Landau, Elizabeth; Chou, Felicia; Washington, Dewayne; Porter, Molly (16 October 2017). "NASA Missions Catch First Light from a Gravitational-Wave Event". NASA. https://www.jpl.nasa.gov/news/news.php?feature=6975. 
  37. ↑ Albert, A. (16 Oct 2017). "Search for high-energy neutrinos from binary neutron star merger GW170817 with ANTARES, IceCube, and the Pierre Auger Observatory". The Astrophysical Journal 850 (2): L35. doi:10.3847/2041-8213/aa9aed. Bibcode: 2017ApJ...850L..35A. 
  38. ↑ "Event Horizon Telescope" (in en). https://eventhorizontelescope.org/home. 
  39. ↑ "Virginia Student Earns Honor of Naming NASA's Next Mars Rover". 5 March 2020. https://www.nasa.gov/press-release/virginia-middle-school-student-earns-honor-of-naming-nasas-next-mars-rover. 
  40. ↑ "Alabama High School Student Names NASA's Mars Helicopter" (in en). https://mars.nasa.gov/news/8659/alabama-high-school-student-names-nasas-mars-helicopter/. 



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