Transcript: Venus, second planet out from the Sun, is the sister planet to the Earth, closest among all the planets to the Earth in size and mass. Its atmosphere is composed of 96 percent carbon dioxide and 4 percent nitrogen with very small amounts of water vapor, argon, sulfur dioxide, and...
Published 07/20/11
Transcript: Mercury takes 88 days to orbit the Sun and 59 days to spin once on it’s axis with respect to the stars. Thus a Mercury day is exactly two thirds of a Mercury year, and this simple fraction is not a coincidence. It’s related to tidal forces and resonances acting to align the spin...
Published 07/20/11