Lecture 8 - Lecture 8 9/23/10 All solid objects in the...

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Lecture 8 – 9/23/10 All solid objects in the solar system show lots of evidence of impact craters Mercury has rays (ejecta) extending from its craters a) Basins are also found similar to the moon Discovery scarp a) Probably is a compression that happened because Mercury had a thinner lithosphere than the moon which led to more tectonic activity. Mercury’s mass is larger than the moon but smaller than earths. You can see signs of stress and compression from a flyby of Mercury Mercury can’t make a total solar eclipse because it’s angular size is a lot smaller since its farther away Venus facts a) Conditions used to be very similar to earth’s b) Gravity is at 0.9 (100lbs = 90lbs) c) Rotates slightly retrograde (opposite) probably due to something that’s moon sized that collided with Venus d) Sidereal day is -243 earth days, orbital period is 225 earth days, and solar day is 117 earth days i) Solar day tidal locking is a factor but it’s with the earth not the sun
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This note was uploaded on 05/03/2011 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas.

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Lecture 8 - Lecture 8 9/23/10 All solid objects in the...

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