Near Earth Objects (NEOs) are asteroids or comets whose orbits sometimes bring them close to the earth's orbit. An NEO could therefore someday collide with the Earth -- giving them considerably more parochial interest than most objects in astronomy.
October 4, 2013
Runaway Binary Stars
CfA astronomers made a remarkable and fortuitous discovery in 2005: an extremely fast moving star, clocked going over three million kilometers an hour.
September 26, 2013
The Intergalactic Medium in the Young Universe
In its earliest years, the universe was so hot that electrons and protons could not bind together in neutral atoms: all of the gas in the cosmos was ionized.
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