The Universe is probably devoid of life, but experts say we may never be sure
Something 20 times Jupiter's size may be orbiting a nearby star
Dale Andersen, a researcher at the SETI Institute, discusses everything from microbes in Antarctica to intelligent extraterrestrials.
Listen to recordings collected by NASA's spacecraft
Scientists begin the search for DNA on Mars
SETI has come a long way over the years, but is the search really important?