December 26, 2008 X-Ray Emission from Young Stars A newly-formed star usually has a disk of gas and dust around it. This disk (the source of possible future planets) can generate intense X-ray radiation as its material falls onto the star's surface.   Read More...

December 19, 2008 Dark Energy is Now a Little Less Dark Eleven years ago this winter two teams of astronomers, one of them led by CfA scientists, astonished the world with their announcement that the universe would expand forever.  Read More...

December 12, 2008 Circumstellar Shells of Gas The second brightest object in the sky outside of our solar system is the variable star CW Leo, located about 450 light-years away in the direction of the constellation of Leo (the brightest object in the sky is the southern hemisphere star called Eta Carina).  Read More...