Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600
million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s geological history?
The quest to put Americans on the moon before the Soviets do. During the Space Race, a couple of astronauts went up into space only to be tragically killed in an explosion.
