universetoday.com
Happy Birthday Vanguard 1, and Welcome Home? - Universe Today
Jim Oberg has written a very interesting article at MSNBC.com, commemorating the 50th anniversary of the launch of mankind’s fourth artificial satellite, Vanguard 1. While it is no longer functioning or communicating, it is the oldest satellite still in orbit. Jim says, “Vanguard 1 was the first artificial earth satellite powered by solar cells, and …