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Orbit

Orionids Meteor Shower. (NASA )

Astronomers Estimate Milky Way Holds 17-Billion Earth-Sized Planets

Astronomers estimate one in six stars in our Milky Way galaxy has a planet the size of Earth orbiting it. That translates to at least 17 billion Earth-size planets.

01/07/2013

Artist's rendering of the Upper Atmosphere Research Satellite, or UARS, burning up as it re-enters earth's atmosphere. (NASA)

NASA Satellite Crashes To Earth, Visible From California Skies

A NASA satellite was visible in the skies over California as it entered the atmosphere, before crashing into Earth.

09/24/2011