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A new study shows energy output from 200,000 galaxies is half what it was billions of years ago. It's further evidence the universe is slowly declining. This undated NASA Hubble Space Telescope image shows the spiral galaxy NGC 1512 captured in all wavelengths from ultraviolet to infrared. Kevin Dietsch/UPI/Landov hide caption

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Kevin Dietsch/UPI/Landov

The SpaceX Falcon 9 rocket and Dragon spacecraft break apart shortly after liftoff from the Cape Canaveral Air Force Station in Cape Canaveral, Fla., on June 28. SpaceX CEO Elon Musk said Monday the failure of a steel strut likely caused the rocket to explode. John Raoux/AP hide caption

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John Raoux/AP

Harry Kroto, pictured in 1996, displays a model of the geodesic-shaped carbon molecules that he helped discover. Michael Scates/AP hide caption

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Michael Scates/AP

'Buckyballs' Solve Century-Old Mystery About Interstellar Space

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The new spacecraft, called LightSail, is orbiting Earth. Future versions could travel to the moon and beyond. The Planetary Society hide caption

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The Planetary Society

Solar Sail Unfurls In Space

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The view of the universe known as the Hubble Deep Field, presented in 1996, shows classical spiral and elliptical shaped galaxies, as well as a variety of other galaxy shapes. NASA/AP hide caption

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NASA/AP