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
Nov 25, 2015 12:15 AM ET
A century after Albert Einstein unveiled a new concept to explain gravity, his so-called general relativity theory remains fertile ground for scientific observations and experiments.
Nov 24, 2015 06:20 PM ET
Exactly 100 years ago on Nov. 25, 2015, physicist Albert Einstein, then 36, presented a fourth and final lecture to the Prussian Academy of Sciences about his new general theory of relativity.
Nov 24, 2015 09:57 AM ET
Jeff Bezos' Blue Origin space launch company successfully returned a New Shepard rocket and capsule after blastoff.
Nov 23, 2015 01:00 PM ET
When considering landing sites on Mars, NASA astronauts say they don’t care where they go -- just don't kill them.
Nov 23, 2015 11:00 AM ET
A new study shows the moon is likely to break apart before it hits the atmosphere, creating a debris ring that will encircle Mars for millions of years.
Nov 18, 2015 01:00 PM ET
For the first time, astronomers have directly observed a planet in the making.
Nov 17, 2015 07:00 AM ET
In the search for Earth-like worlds beyond the solar system, Kepler-438b seems to have it all. Alas, its angry star is a poor host for any potential lifeforms.
Nov 13, 2015 12:40 PM ET
A pale blue dot may not be the only hint of life beyond the solar system. New research suggests astronomers pay attention to pale orange worlds as well, since they may resemble what Earth looked like earlier in its history.
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