From NASA’s guide to Civil Helicopter Safety: Basic Flying Rules: Try to stay in the middle of the air. Do not go near the edges of it. The edges of the air can be recognized by the appearance of ground, buildings, sea, trees and interstellar space. It is much more difficult to fly there
Why does NASA have to worry about the weather on Earth to determine whether it gets information from a big project like cassini? A while ago, I was saying that they should put comms relay satellites around Mars; I thought it was common sense that they should be orbiting Earth by now. After all, just [...]