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Light Echoes Give Clues to Protoplanetary Disk

By Jet Propulsion Laboratory/NASA

April 27, 2016

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Imagine you want to measure the size of a room, but it's completely dark. If you shout, you can tell if the space you're in is relatively big or small, depending on how long it takes to hear the echo after it bounces off the wall.

From Jet Propulsion Laboratory/NASA
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