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Light Echoes Give Clues to Protoplanetary Disk
This illustration shows a star surrounded by a protoplanetary disk.
Credit: NASA/JPL-Caltech
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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