Massive iceberg breaks off Greenland glacier

Image provided by NASA -- captured by the Moderate Resolution Imaging Spectroradiometer on the Aqua satellite -- shows a crescent shaped crack (C) in the Petermann Glacier in Greenland. The massive iceberg broke off of a glacier in Greenland, in what could be the latest indication of global warming.

Most Earth-like planet discovered

(Reuters) - The most Earth-like planet ever discovered is circling a star 600 light years away, a key finding in an ongoing quest to learn if life exists beyond Earth, scientists said on Monday.

A diagram comparing our own solar system to Kepler-22, a star system containing the first ''habitable zone'' planet discovered by NASA's Kepler mission, is seen in this undated handout picture released by NASA, December 5, 2011.

Credit: Reuters/NASA/Ames/JPL-Caltech/Handout

The planet, called Kepler-22b, joins a list of more than 500 planets found to orbit stars beyond our solar system. It is the smallest and the best positioned to have liquid water on its surface -- among the ingredients necessary for life on Earth.