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ALS Lunar Observers Certificate List of Objects (2616 words) |
 | Crater Fracastorius: a large crater which demonstrates the geologic history of the region: it transects the Nectaris Basin wall, indicating that it occurred after the Nectaris Basin impact. |
 | Crater chains are generally the result of a string of meteorites which are still gravitationally bound. |
 | Crater Tycho: One of the youngest complex craters on the moon. |
| Impact Craters: Research Links for Students (844 words) |
 | The Barringer Meteorite Crater (also known as "Meteor Crater") is a gigantic hole in the middle of the arid sandstone of the Arizona desert. |
 | Impact craters are a common feature on most planetary bodies because projectiles (such as meteoroids, asteroids, and comets) have collided with planetary surfaces for billions of years. |
 | In the past, people have suggested that the lunar craters were formed by volcanoes, bursting bubbles in a lava sea, asteroid impacts, and even interplanetary lightning bolts(!). |