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Is it true that Jupiter protects Earth?
Jupiter's gravity slings long-period comets out of harm's way, while nudging some asteroids closer to Earth. And, in 1770, Jupiter took aim on Earth - but missed.
November 25, 2015
Blue Origin soft-lands a rocket!
And Jeff Bezos, which founded the private spaceflight company, sends his first-ever tweet. Congratulations, Blue Origin!
November 24, 2015
The Cheshire Cat group of galaxies
A lot of dark matter lies between us and these distant galaxies. Light distortion from gravitational lensing creates the "cat."
November 23, 2015
A nearby dark matter galaxy?
Measurements of the velocities of just six stars in a galaxy of only 1,000 visible stars suggest the highest concentration of dark matter of any known galaxy. Holy grail? Or is there another explanation?
November 22, 2015
Tiny, ultracool star is super stormy
"If we lived around a star like this one, we wouldn't have any satellite communications. In fact, it might be extremely difficult for life to evolve at all ..." said Harvard astrophysicist.
November 20, 2015
Texas telescope to explore dark energy
A mysterious and largely unknown dark energy is thought to pervade our universe. A telescope in West Texas is poised to survey a million galaxies, to explore it.
November 20, 2015
How a year in space changes bodies
Astronauts are spending a year aboard the International Space Station, and researchers are looking at what happens to their bodies at the molecular level.
November 20, 2015
Most Earthlike exoplanet is uninhabitable
Kepler-438b - 470 light years from Earth - ranks highest on the Earth Similarity Index. But radiation from its violent parent star makes it uninhabitable.
November 18, 2015
Mars rover heads for active dunes
No Mars rover has yet visited a sand dune, as opposed to smaller sand ripples or drifts. Curiosity will visit actual Mars dunes in the next few days.
November 17, 2015
Astronomers take a galaxy’s pulse
Astronomers had not considered the effect of variable stars on the light of distant galaxies. A new technique lets them measure the galaxies' "heartbeats."
November 16, 2015
