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2 basic questions about the Moon
Hello, I can't seem to find the answers to 2 basic questions
about the Moon. Is there an astronaut or someone like that who could help me out? (1) Why are the mare almost all on the side facing Earth? I've read they are perhaps ancient lava flows (but not from a volcano I guess because there doesn't seem to be any volcano in the middle of them?) And it appears from the Apollo photos they are brownish in direct sunlight if you are standing in the middle of them? And what color would the highlands be, grey? And (sorry this is actually several questions) what is the surface like walking on the Moon, it is hard and crusty or rather like sand? Is the latter why it was so difficult to plant the American flag and why it fell over? (2) (Shorter question) If I straighten out the Earth's revolution around the Sun so it's a straight line, what curve is the Moon's motion along that line most similar to, perhaps a sine wave? I know it's actually an incredibly complicated curve but that's the general shape of it, i.e. there are no little loops or sudden changes of direction? Thanks! |
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I've read some good articles about the forming of our moon, it is not
uniform in make up, the otherside is made up of lighter rock than the earth facing side. The 'seas' where made from when large impacts happened and it remelted the vast areas which flooded the area. No Volcanos where ever on the moon. As for the flag of Apollo 11, they placed it to close to the lem's base and the exhust from the command section lifting off blew it over. Later missions which placed flags planted them away from the lem's base so that would not happen again. -- "And for the second time in four million years, the monolith awoke." Arthur C.Clarke 2062dyssey three SIAR www.starlords.org Telescope Buyers FAQ http://home.inreach.com/starlord Bishop's Car Fund http://www.bishopcarfund.netfirms.com/ wrote in message m... Hello, I can't seem to find the answers to 2 basic questions about the Moon. Is there an astronaut or someone like that who could help me out? (1) Why are the mare almost all on the side facing Earth? I've read they are perhaps ancient lava flows (but not from a volcano I guess because there doesn't seem to be any volcano in the middle of them?) And it appears from the Apollo photos they are brownish in direct sunlight if you are standing in the middle of them? And what color would the highlands be, grey? And (sorry this is actually several questions) what is the surface like walking on the Moon, it is hard and crusty or rather like sand? Is the latter why it was so difficult to plant the American flag and why it fell over? (2) (Shorter question) If I straighten out the Earth's revolution around the Sun so it's a straight line, what curve is the Moon's motion along that line most similar to, perhaps a sine wave? I know it's actually an incredibly complicated curve but that's the general shape of it, i.e. there are no little loops or sudden changes of direction? Thanks! --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.770 / Virus Database: 517 - Release Date: 9/27/04 |
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starlord wrote:
I've read some good articles about the forming of our moon, it is not uniform in make up, the otherside is made up of lighter rock than the earth facing side. The 'seas' where made from when large impacts happened and it remelted the vast areas which flooded the area. No Volcanos where ever on the moon. (snip) The apparent lack of volcanism fits with the Earth impact hypothesis of lunar formation. That hypothesis assumes that the entire lunar mass was ejected into the vacuum of space in molten or vapor form, which would allow anything gaseous to be separated from the rocky material (and either be swept away in the solar wind, or reabsorbed into Earth's atmosphere), before it coalesced into a moon. The resultant body would be very deficient in high vapor pressure materials, so there would be no gas pressure to drive any volcanic expulsions. If the hardened crust were broken by impact, the surface would just sink into the lava below the molten subsurface and a new surface would harden. This is what the Maria look like. Io is just the opposite extreme, with a great bounty of volatile material in its makeup, so lots of explosive eruptions. -- John Popelish |
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