APOD: The Regolith of Asteroid Eros (2011 Jun 19)

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APOD Robot
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APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by APOD Robot » Sun Jun 19, 2011 4:05 am

Image The Regolith of Asteroid Eros

Explanation: From fifty kilometers above asteroid Eros, the surface inside one of its largest craters appears covered with an unusual substance: regolith. The thickness and composition of the surface dust that is regolith remains a topic of much research. Much of the regolith on 433 Eros was probably created by numerous small impacts during its long history. In this representative-color view taken by the robot spacecraft NEAR-SHOEMAKER that orbited Eros in 2000 and 2001, brown areas indicate regolith that has been chemically altered by exposure to the solar wind during micrometeorite impacts. White areas are thought to have undergone relatively less exposure. The boulders visible inside the crater appear brown, indicating either that they are old enough to have a surface itself tanned by the solar wind, or that they have somehow become covered with some dark surface dust. This July, NASA's Dawn spacecraft will orbit giant main belt asteroid Vesta.

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djak.
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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by djak. » Sun Jun 19, 2011 10:18 am

brown areas indicate regolith that has been chemically altered by exposure to the solar wind during micrometeorite impacts.
I don't understand the "during micrometeorite impacts" part. Why wouldn't it be altered by the solar wind at other times? Is it that only subsurface material is chemically altered, but if so why couldn't it be that the brown color comes from subsurface material that hasn't yet been exposed to as much solar wind instead?

B

Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by B » Sun Jun 19, 2011 11:03 am

To all extraterrestrial beings,

would you please retrieve and return to the earth the spaceprobes indicated. thank you for your cooperation.

-messenger

-mariner 10

-

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orin stepanek
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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by orin stepanek » Sun Jun 19, 2011 1:10 pm

Astronauts invent fender extender! :mrgreen: This was to protect from moon dust.
Orin

Smile today; tomorrow's another day!

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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by jman » Sun Jun 19, 2011 2:13 pm

Exactly how many extraterrestrial bodies have our probes visited?

bobguz

Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by bobguz » Sun Jun 19, 2011 3:43 pm

IMHO speculation on the nature of, "The Regolith of Asteroid Eros", is premature - at best. Better to imagine, "How many angels can dance on the head of a pin?".

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BMAONE23
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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by BMAONE23 » Sun Jun 19, 2011 4:11 pm

jman wrote:Exactly how many extraterrestrial bodies have our probes visited?
Here is a list of All probes to visit the various solar system bodies
WIKI list of Solar System Probes

Wolf Kotenberg

Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by Wolf Kotenberg » Sun Jun 19, 2011 9:29 pm

this is the image that caught my attention. That bright square object on the right, inside the carter lkooks fresh and tto square

http://near.jhuapl.edu/iod/20000503/index.html

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rstevenson
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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by rstevenson » Mon Jun 20, 2011 12:23 am

Wolf Kotenberg wrote:this is the image that caught my attention. That bright square object on the right, inside the carter lkooks fresh and tto square
http://near.jhuapl.edu/iod/20000503/index.html
Uh oh. I told them the camouflage wasn't working.

Rob

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jman
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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by jman » Mon Jun 20, 2011 2:23 am

BMAONE23 wrote:Here is a list of All probes to visit the various solar system bodies
WIKI list of Solar System Probes
Thanks!

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Re: APOD: The Regolith of Asteroid Eros (2011 Jun 19)

Post by BMAONE23 » Mon Jun 20, 2011 2:11 pm

jman wrote:
BMAONE23 wrote:Here is a list of All probes to visit the various solar system bodies
WIKI list of Solar System Probes
Thanks!
You're welcome :ssmile: