The discovery that our galaxy holds billions of inhabitable planets has lent new vigor to an old question: Is there life on other planets?
Arctic sea ice volume increased a surprising amount during the cool summer of 2013, but researchers say if overall temperatures continue rising, ice will melt in the long run.
Photographs capturing all of the Earth in a single frame are actually quite rare; many you've seen are composites assembled from multiple shots. But the DSCOVR satellite is set to change that.
A Russian billionaire is dedicating $100 million to the search for extraterrestrial life, injecting much-needed funding into efforts to answer one of science's biggest questions.