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Why is the Moon silvery and not Red?

As we all know Sappho named the moon in her poetry as silvery, depite it being made of cheese as evidenced by its creamy color. Although Baron von Muncchausen went there he failed to answer the qestion I wonder. Asteroids were always red in the computer shot-em up games I played as a kid.

 

I never knew why? The BBC answered this here:

http://news.bbc.co.uk/2/hi/science/nature/8468999.stm

 

but not why if broken regolith is red, why is the moon not red?

 

 

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tbrucenyc says:

Unbroken asteroids are red...

"The solar wind damages the minerals and turns them red - like sunburn.

Broken, (or resurfaced) they are not red...

"The earth just shakes it enough that the the rubble flips over - resurfacing it." - BBC

The Earth's Moon has no atmosphere or intrinsic magnetic field, and consequently its surface is bombarded with the full solar wind.

Despite this our moon has not turned red from the solar wind...

"Blanketed atop the Moon's crust is a highly comminuted (broken into ever smaller particles) and "impact gardened" surface layer called regolith..." wikipedia

 

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posted on 2010-01-25 21:29:56 | Report abuse


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Daniel36 says:

it doesn't contain iron...............

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posted on 2010-01-27 10:30:14 | Report abuse


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Paul_Pedant says:

The original "scientific" article looks like pseudo-science (or worse). The only red around should be caused by the writer's embarressment.

(1) "Turns them red - like sunburn". Completely spurious analogy between a physiological protective reaction in the epidermis of an animal, and a supposed chemical reaction of an unspecified mineral in a vacuum exposed to various radiation and bombardment phenomena.

(2) "used an infrared telescope to study the colour of asteroids in space". No, an infrared telescope filters what you see in a specified range of wavelengths in the infrared. What's that going to tell you about the visible red spectrum, then?

(3) "Dr Chapman, who was not involved in the study, wrote an accompanying article in Nature explaining its significance": and presumably by this caveat hopes thereby to preserve his reputation.

(4) "The earth just shakes it enough that the the rubble flips over - resurfacing it." Gravity is proportional to distance.squared. Any meteorite is at least 6500km from the Earth's centre of attraction. Even for a 1km meteorite (!), the differential gravitational effect from side to side is about 1 part in 50 million. And that is supposed to rattle the stones? Or are those perfect Aristotlian crystal spheres getting worn out?

 

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posted on 2010-03-08 22:12:41 | Report abuse


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