Astronomy 10 10.6.06

Astronomy 10 10.6.06 - So thin that it essentially isn’t...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Astronomy 10 Surfaces 10.6.06 Solar system is 4.5 billion years old o Planets have had times to cool off and become solid rock o All of the objects of the solar system have had time to collect impacts o Accretion: building up, getting together Planets go through accretion Craters are the result of impacts o There is an explosion when the object hits o There is a shockwave o The Object melts o Resulting crater has a rim, and ejecta blanket and a pulverized crust Surface of the Moon o Looking at the most recent craters, can see rays around them Explanation is that the rays are made of tiny glass balls Result of dust that melted into a sphere, cooled, and hit the Moon as a solid sphere of glass Some of the craters have central peaks Bigger and smaller craters do not have central peaks There is a little bit of very slow erosion on the Moon Craters with sharp edges and craters with bell edges are the result of the slow erosion o Have a thin atmosphere of ionized sodium particles
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: So thin that it essentially isn’t there • Surface of Mercury o Looks very similar to the surface of the Moon o Has craters that have central peaks o Have a thin atmosphere of ionized sodium particles So thin that it essentially isn’t there • Surface of Venus o Can’t see the surface of Venus because of its clouds o Use radar to show that there are also impact craters on Venus • Surface of Mars o Craters on Mars are generally more eroded then the craters of the Moon and Mercury because it has an atmosphere o Has a crater that is in a valley that had some activity in it o Can see the cross-section of the crater Rim is by an area of the valley that has a lot of dust deposited Dust is deposited in the crater • Ganymede o Covered by solid ice o Ice is not as strong as rock, so craters don’t’ last as long • Callisto o Covered in impacts o Anymore impacts would erase other impacts...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online