Outer space has many mysteries, among them are these fables about NASA that have permeated the public’s memory
April 15, 2011 | By Mark Strauss
On the surprise evidence of flowing water on Mars
February 2007 | By Laura Helmuth
It's hard enough to identify fossilized microbes on Earth. How would we ever recognize them on Mars?
May 2005 | By Carl Zimmer
The president envisions a future human mission to Mars, but medical researchers say surviving the journey is no spacewalk
June 2004 | By Jane Ellen Stevens