T Tauri stars - infant solar systems - were thought to have powerful stellar winds. Astronomers have now observed T Tauri winds and might know what's causing them.
Before sunrise on October 8, the bright full moon over North America will turn a lovely shade of red. It's a total lunar eclipse that's visible from all parts of the U.S.
NASA's MAVEN spacecraft - first spacecraft dedicated to exploring Mars' upper atmosphere - successfully entered orbit on September 21, 2014 at 10:24 p.m. EDT.
A new and tantalizing hint of mysterious dark matter has been found by the Alpha Magnetic Spectrometer particle detector aboard the International Space Station.
Astronomers thought mergers formed giant elliptical galaxies. Now, for at least 24 observed galaxies, mergers have formed flattened, circular disks of dust and gas.