Sign In

Communications of the ACM

ACM News

Light Echoes Give Clues to Protoplanetary Disk

View as: Print Mobile App Share:
Star surrounded by 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
View Full Article



No entries found

Sign In for Full Access
» Forgot Password? » Create an ACM Web Account