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November 24, 2014

Two objects with comet-like orbits passed through the solar system in 2013 and 2014, but showed no activity. On the left is C/2013 P2 Pan-STARRS and on the right is C/2014 S3 Pan-STARRS. Photo: Institute of Astronomy, University of Hawaii.

"Naked" comets may reveal the secret of the origin of the solar system

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An artist's illustration of the species Cambaytherium thewissi, the ancestor of horses and rhinoceroses whose fossils were discovered in India. Illustration by Elaine Kasmer for Johns Hopkins University

The origin of horses and rhinoceroses is in India

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