Near-Earth asteroid a "rubble pile"
Posted: Fri, Jun 2, 2006, 8:42 AM ET (1242 GMT)
A small near-Earth asteroid recently visited by a Japanese spacecraft is little more than a "rubble pile" of loosely-pack debris from other asteroid collisions, scientists conclude. In papers published in this week's issue of the journal Science, planetary scientists said studies of the asteroid Itokawa by the Japanese spacecraft Hayabusa showed that the asteroid's surface was littered with small boulders and gravel, leading scientists to conclude that the asteroid is not a monolithic rock but instead debris from a previous asteroid collision held together by its own gravity. The asteroid has a porosity of 40%, further evidence that the object is loosely packed together. Spectroscopic analysis of the asteroid turned up evidence of iron and minerals such as olivine and pyroxene, although no signs of differentiation.
A small near-Earth asteroid recently visited by a Japanese spacecraft is little more than a "rubble pile" of loosely-pack debris from other asteroid collisions, scientists conclude. In papers published in this week's issue of the journal Science, planetary scientists said studies of the asteroid Itokawa by the Japanese spacecraft Hayabusa showed that the asteroid's surface was littered with small boulders and gravel, leading scientists to conclude that the asteroid is not a monolithic rock but instead debris from a previous asteroid collision held together by its own gravity. The asteroid has a porosity of 40%, further evidence that the object is loosely packed together. Spectroscopic analysis of the asteroid turned up evidence of iron and minerals such as olivine and pyroxene, although no signs of differentiation.
Related Links:
| <<previous article | next article>> |
|
news in brief
|
|
|
|
news links
|
|
Tuesday, November 5
Marles claims JP9102 axing is 'change of direction, not cancellation', as industry picks up the pieces
Defence Connect (Australia) — 5:55 am ET (1055 GMT) SpaceX Cargo Dragon Heads To Space Station
Aviation Week — 5:52 am ET (1052 GMT) Centaur upper stage installation recognizes trailblazing space program
US Space Force — 5:50 am ET (1050 GMT) Fifth time’s a charm as H3 rocket puts defense satellite in orbit
Japan Times — 5:47 am ET (1047 GMT) Why it costs India so little to reach the Moon and Mars
BBC — 5:46 am ET (1046 GMT) |
