Astronomy:Interplanetary dust cloud

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Short description: Small particles between planets
Artist's concept of a view from an exoplanet, with light from an extrasolar interplanetary dust cloud

The interplanetary dust cloud, or zodiacal cloud, consists of cosmic dust (small particles floating in outer space) that pervades the space between planets within planetary systems, such as the Solar System.[1] This system of particles has been studied for many years in order to understand its nature, origin, and relationship to larger bodies.

In the Solar System, the interplanetary dust particles have a role in scattering sunlight and in emitting thermal radiation, which is the most prominent feature of the night sky's radiation, with wavelengths ranging 5–50 μm.[2] The particle sizes of grains characterizing the infrared emission near Earth's orbit typically range 10–100 μm.[3] Microscopic impact craters on lunar rocks returned by the Apollo Program[4] revealed the size distribution of cosmic dust particles bombarding the lunar surface. The ’’Grün’’ distribution of interplanetary dust at 1 AU,[5] describes the flux of cosmic dust from nm to mm sizes at 1 AU.

The total mass of the interplanetary dust cloud is approximately the mass of an asteroid of radius 15 km (with density of about 2.5 g/cm3).[6] Straddling the zodiac along the ecliptic, this dust cloud is visible as the zodiacal light in a moonless and naturally dark sky and is best seen sunward during astronomical twilight.

The Pioneer spacecraft observations in the 1970s linked the zodiacal light with the interplanetary dust cloud in the Solar System.[7] Also, the VBSDC instrument on the New Horizons probe was designed to detect impacts of the dust from the zodiacal cloud in the Solar System.[8]


The sources of interplanetary dust particles (IDPs) include at least: asteroid collisions, cometary activity and collisions in the inner Solar System, Kuiper belt collisions, and interstellar medium grains (Backman, D., 1997). The origins of the zodiacal cloud have long been subject to one of the most heated controversies in the field of astronomy.

It was believed that IDPs had originated from comets or asteroids whose particles had dispersed throughout the extent of the cloud. However, further observations have suggested that Mars dust storms may be responsible for the zodiacal cloud's formation.[9][1]

Life cycle of a particle

The main physical processes "affecting" (destruction or expulsion mechanisms) interplanetary dust particles are: expulsion by radiation pressure, inward Poynting-Robertson (PR) radiation drag, solar wind pressure (with significant electromagnetic effects), sublimation, mutual collisions, and the dynamical effects of planets (Backman, D., 1997).

The lifetimes of these dust particles are very short compared to the lifetime of the Solar System. If one finds grains around a star that is older than about 10,000,000 years, then the grains must have been from recently released fragments of larger objects, i.e. they cannot be leftover grains from the protoplanetary disk (Backman, private communication). Therefore, the grains would be "later-generation" dust. The zodiacal dust in the Solar System is 99.9% later-generation dust and 0.1% intruding interstellar medium dust. All primordial grains from the Solar System's formation were removed long ago.

Particles which are affected primarily by radiation pressure are known as "beta meteoroids". They are generally less than 1.4 × 10−12 g and are pushed outward from the Sun into interstellar space.[10]

Cloud structures

The interplanetary dust cloud has a complex structure (Reach, W., 1997). Apart from a background density, this includes:

  • At least 8 dust trails—their source is thought to be short-period comets.
  • A number of dust bands, the sources of which are thought to be asteroid families in the main asteroid belt. The three strongest bands arise from the Themis family, the Koronis family, and the Eos family. Other source families include the Maria, Eunomia, and possibly the Vesta and/or Hygiea families (Reach et al. 1996).
  • At least 2 resonant dust rings are known (for example, the Earth-resonant dust ring, although every planet in the Solar System is thought to have a resonant ring with a "wake") (Jackson and Zook, 1988, 1992) (Dermott, S.F. et al., 1994, 1997)

Dust collection on Earth

In 1951, Fred Whipple predicted that micrometeorites smaller than 100 micrometers in diameter might be decelerated on impact with the Earth's upper atmosphere without melting.[11] The modern era of laboratory study of these particles began with the stratospheric collection flights of D. E. Brownlee and collaborators in the 1970s using balloons and then U-2 aircraft.[12]

Although some of the particles found were similar to the material in present-day meteorite collections, the nanoporous nature and unequilibrated cosmic-average composition of other particles suggested that they began as fine-grained aggregates of nonvolatile building blocks and cometary ice.[13][14] The interplanetary nature of these particles was later verified by noble gas[15] and solar flare track[16] observations.

In that context a program for atmospheric collection and curation of these particles was developed at Johnson Space Center in Texas.[17] This stratospheric micrometeorite collection, along with presolar grains from meteorites, are unique sources of extraterrestrial material (not to mention being small astronomical objects in their own right) available for study in laboratories today.


Spacecraft that have carried dust detectors include Pioneer 10, Pioneer 11, Ulysses (heliocentric orbit out to the distance of Jupiter), Galileo (Jupiter Orbiter), Cassini (Saturn orbiter), and New Horizons (see Venetia Burney Student Dust Counter).[8]

Major Review Collections

Collections of review articles on various aspects of interplanetary dust and related fields appeared in the following books:

In 1978 Tony McDonnell edited the book Cosmic Dust[18] which contained chapters[19] on comets along with zodiacal light as indicator of interplanetary dust, meteors, interstellar dust, microparticle studies by sampling techniques, and microparticle studies by space instrumentation. Attention is also given to lunar and planetary impact erosion, aspects of particle dynamics, and acceleration techniques and high-velocity impact processes employed for the laboratory simulation of effects produced by micrometeoroids.

2001 Eberhard Grün, Bo Gustafson, Stan Dermott, and Hugo Fechtig published the book Interplanetary Dust.[20] Topics covered[21] are: historical perspectives; cometary dust; near-Earth environment; meteoroids and meteors; properties of interplanetary dust, information from collected samples; in situ measurements of cosmic dust; numerical modeling of the Zodiacal Cloud structure; synthesis of observations; instrumentation; physical processes; optical properties of interplanetary dust; orbital evolution of interplanetary dust; circumplanetary dust, observations and simple physics; interstellar dust and circumstellar dust disks.

2019 Rafael Rodrigo, Jürgen Blum, Hsiang-Wen Hsu, Detlef V. Koschny, Anny-Chantal Levasseur-Regourd, Jesús Martín-Pintado, Veerle J. Sterken, and Andrew Westphal collected reviews in the book Cosmic Dust from the Laboratory to the Stars.[22] Included are discussions[23] of dust in various environments: from planetary atmospheres and airless bodies over interplanetary dust, meteoroids, comet dust and emissions from active moons to interstellar dust and protoplanetary disks. Diverse research techniques and results, including in-situ measurement, remote observation, laboratory experiments and modelling, and analysis of returned samples are discussed.

See also


  1. 1.0 1.1 "What scientists found after sifting through dust in the solar system - bri". EurekAlert! (NASA). 12 March 2019. 
  2. Levasseur-Regourd, A.C., 1996
  3. Backman, D., 1997
  4. Morrison, D.A.; Clanton, U.S. (1979). "Properties of microcraters and cosmic dust of less than 1000 Å dimensions". Proceedings of Lunar and Planetary Science Conference 10th, Houston, Tex., March 19–23, 1979 (New York: Pergamon Press Inc.) 2: 1649–1663. Bibcode1979LPSC...10.1649M. Retrieved 3 February 2022. 
  5. Grün, E.; Zook, H.A.; Fechtig, H.; Giese, R.H. (May 1985). "Collisional balance of the meteoritic complex". Icarus 62 (2): 244–272. doi:10.1016/0019-1035(85)90121-6. Bibcode1985Icar...62..244G. Retrieved 23 January 2022. 
  6. Pavlov, Alexander A. (1999). "Irradiated interplanetary dust particles as a possible solution for the deuterium/hydrogen paradox of Earth's oceans". Journal of Geophysical Research: Planets 104 (E12): 30725–28. doi:10.1029/1999JE001120. PMID 11543198. Bibcode1999JGR...10430725P. 
  7. Hannter (1976). Pioneer 10 observations of zodiacal light brightness near the ecliptic - Changes with heliocentric distance. 
  8. 8.0 8.1 Template:Bare URL PDF
  9. Shekhtman, Svetlana (2021-03-08). "Serendipitous Juno Detections Shatter Ideas About Zodiacal Light". "While there is good evidence now that Mars, the dustiest planet we know of, is the source of the zodiacal light, Jørgensen and his colleagues cannot yet explain how the dust could have escaped the grip of Martian gravity." 
  10. "Micrometeorite Background". GENESIS Discovery 5 Mission. Caltech. 
  11. Whipple, Fred L. (December 1950). "The Theory of Micro-Meteorites. Part I. In an Isothermal Atmosphere". Proceedings of the National Academy of Sciences of the United States of America 36 (12): 687–695. doi:10.1073/pnas.36.12.687. PMID 16578350. Bibcode1950PNAS...36..687W. 
  12. Brownlee, D. E. (December 1977). "Interplanetary dust - Possible implications for comets and presolar interstellar grains". In: Protostars and Planets: Studies of Star Formation and of the Origin of the Solar System. (A79-26776 10-90) Tucson: 134–150. Bibcode1978prpl.conf..134B. 
  13. P. Fraundorf, D. E. Brownlee, and R. M. Walker (1982) Laboratory studies of interplanetary dust, in Comets (ed. L. Wilkening, U. Arizona Press, Tucson) pp. 383-409.
  14. Walker, R. M. (January 1986). "Laboratory studies of interplanetary dust". In NASA 2403: 55. Bibcode1986NASCP2403...55W. 
  15. Hudson, B.; Flynn, G. J.; Fraundorf, P.; Hohenberg, C. M.; Shirck, J. (January 1981). "Noble Gases in Stratospheric Dust Particles: Confirmation of Extraterrestrial Origin". Science 211 (4480): 383–386(SciHomepage). doi:10.1126/science.211.4480.383. PMID 17748271. Bibcode1981Sci...211..383H. 
  16. Bradley, J. P.; Brownlee, D. E.; Fraundorf, P. (December 1984). "Discovery of nuclear tracks in interplanetary dust". Science 226 (4681): 1432–1434.ResearchsupportedbyMcCroneAssociates. doi:10.1126/science.226.4681.1432. ISSN 0036-8075. PMID 17788999. Bibcode1984Sci...226.1432B. 
  17. "Cosmic Dust". NASA – Johnson Space Center program, Cosmic Dust Lab. 6 January 2016. 
  18. McDonnel, J.A.M. (1978). Cosmic Dust. Chichester, New York: John Wiley & Sons. pp. 607–670. ISBN 0-471-99512-6. Retrieved 22 January 2022. 
  19. McDonnell, J. A. M. (1978). content Cosmic Dust. Retrieved 5 February 2022. 
  20. Grün, E.; Gustafson, B.A.S.; Dermott, S.; Fechtig, H. (2001). Interplanetary Dust. Berlin: Springer. ISBN 978-3-540-42067-5. Retrieved 5 February 2022. 
  21. content Interplanetary Dust. Astronomy and Astrophysics Library. 2001. doi:10.1007/978-3-642-56428-4. ISBN 978-3-642-62647-0. Retrieved 5 February 2022. 
  22. Rodrigo, R.; Blum, J.; Hsu, H.W.; Koschny, D.; Levasseur-Regourd, A.C.; Pintado, J.M.; Sterken, V.; Westphal, A (2019). Cosmic Dust from the Laboratory to the Stars. Berlin: Springer. ISBN 978-94-024-2009-8. Retrieved 5 February 2022. 
  23. "content Cosmic Dust from the Laboratory to the Stars". 

Further reading