Space.com

What's Hot This Week NASA to Launch New Ocean-Watching Satellite in June By Denise Chow NASA is preparing a sophisticated new observatory, designed to study the relationship between the saltiness of Earth's oceans and the planet's climate, for its launch into orbit next month. Satellite Image Reveals Spread of a Megacity By Jennifer Welsh A newly released satellite image reveals Istanbul, the largest city in Turkey at 15 million inhabitants, is quickly becoming a "megacity" covering almost 700 square miles (1,800 square kilometers). Sponsored by: Photos: Shuttle Endeavour's Final Mission - Part 2 Wounded Rep. Giffords Undergoes Brain Surgery With Husband in Space Is the Rocky Alien Planet Gliese 581d Really Habitable? The Strangest Alien Planets How the Antimatter-Hunting Alpha Magnetic Spectrometer Works (Infographic)