Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
Video: Leslie Kean describes the hard evidence of UFOs and calls for more investigation into them. Plus: Did you know there was a UFO at Chicago's O'Hare Airport?
Scientists reconstruct a story of cataclysmic violence in the Southwest.
Proposed telescope will look for habitable exoplanets and study the nature of dark energy.
Video: MSNBC's Chris Jansing talks with NASA astronauts Mark and Scott Kelly, who will become the first identical twins in space at the same time.
Experts think Van Gogh and Bach would be more appealing than Newton or Einstein.
Robonaut 2 is scheduled to arrive at the International Space Station in November, fields Twitter questions in the meantime.
The mission, which sounds like the theme of 'Deep Impact', would take off in 2106 to take samples of the dangerous asteroid.
Scientists explore how moon dirt could feed plants in future space station greenhouses.
These giant exoplanets are closer together and more tightly bound than any previously discovered planets.
The space agency pours cash and ideas into new innovations for cleaner airplanes.
Video: Astronomers use infrared "eyes" to shed light on these enigmatic cosmic structures.
Inventors hope to market their suit, which includes a roomy helmet and dexterous gloves, to private firms.
Respected scientist redefines gravity -- and possibly the way we see the universe.
Pulsars, or stars that pulse due to rapid spinning, may be the best way to keep time in space.
Scientists lost communication with Galaxy 15 on April 5, and now they are concerned it will disrupt other satellites.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.