1. The Moon & Mercury – Dead Worlds

17. Orbital Period 88 days. Rotational Period: 59 days

30. Craters – how do they form?

31. Meteorite begins to vaporize on impact

32. It’s the expanding vapor , not the impact, that forms the crater. That’s why craters are round, even if the meteorite impacts from a low angle.

33. Crater rims are raised above the surroundings. Rebound of the rock under the impact can form a central peak. Over time, the crater walls can slump, creating terraces.

35. Some craters have rays, or a blanket of material thrown out by the impact.

36. What do the rays indicate about the age of the crater and the energy of the impact?

37. Sometimes craters are formed in long chains

40. What rock are the highlands made of? Anorthosite, a close relative of granite.

49. Mare – singular Maria - plural No plate tectonics, but mountains form at edges of maria.

51. Chocolate pudding will do the same thing, if left on the countertop too long.

55. An active rille on earth.

56. The Apollo 15 landing was made near the famous Hadley rille.

57. Apollo 15 rover in front of Hadley rille.

60. Recent craters have sharp walls with little slumping Inside.

61. Older craters have poorly defined walls with lots of slumping.

62. Lunar soil is very powdery, even slippery. Why would it be slippery?

63. Lunar soil is composed of tiny glass spheres and broken fragments.

65. Lunar rock fragments melted into a breccia.

66. Impacts are still continuing today, but they’re mostly micro-meteorites, like this one.

71. antipode

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81. http://www.astro.psu.edu/users/niel/astro1/slideshows/class41/slides-41.html http://www.mhhe.com/physsci/astronomy/fix/student/chapter9/09f27.html http://zebu.uoregon.edu/~imamura/121/nov10/nov10.html http://btc.montana.edu/messenger/instruments/MercuryCore.gif http://www.pennastroimaging.com/Lunar+Planetary%20Images.htm http://starchild.gsfc.nasa.gov/docs/StarChild/space_level2/apollo11_lem.html