We can't change when or how long we live. All that really counts is what we do. Space exploration has technical, political and mental challenges, but rewards us with surprising knowledge. It's one of humanity's noblest endeavors and the focus of my work since 1987.

Author Stories
Oct 6, 2015 12:20 PM ET
The last thing scientists searching for life on Mars want to find is a colony of hitchhiking microbes from Earth. To that end, an experiment poised to begin week aims to put some of the planet’s most tenacious bacteria through an ultimate survivors’ challenge.
Oct 2, 2015 11:30 AM ET
Our solar system has some prime locations (besides Earth) for alien life.
Sep 29, 2015 12:00 PM ET
The discovery of seasonal water flows on the surface of Mars could galvanize both the search for indigenous life as well plans for future human settlements, but don’t pack your bags quite yet.
Sep 28, 2015 11:00 AM ET
Scientists have their first evidence that trickles of liquid water play a role in sculpting mysterious dark streaks that appear during summertime months on Mars.
Sep 28, 2015 10:40 AM ET
Scientists have solved the mystery of why the comet being studied by Europe’s Rosetta spacecraft is shaped like a rubber duck -- it started off as two separate comets.
Sep 23, 2015 01:00 PM ET
Distant galaxies birthing baby stars up to 1,000 times the rate of the Milky Way have been a long-standing mystery -- until now.
Sep 23, 2015 01:00 PM ET
Scientists have discovered an unexpectedly regular cycle of ice formation and depletion on the surface of a comet, a pattern tied to an orbital dance of shadow and sunlight.
Sep 16, 2015 08:24 AM ET
After a battle, two dueling space tycoons are to become neighbors.
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