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Explore Pic Nasa, Nasa Publie and more!

The center of the earth is actually years younger than its surface, and researchers say it all comes down to the effects of gravity as described by Einstein's theory of general relativity.

Magical Photography From Around The World

Space travel. And look at sun shining down at earth and moon. Gaze at stars, comets, asteroids, galaxies and beyond. I can write pages about this ultimate dream.