Light Echoes Used to Study Protoplanetary Disks

Hello guys, We're here with some new information from NASA :
This illustration shows a star surrounded by a protoplanetary disk. A new study uses data from NASA's Spitzer Space Telescope and four ground-based telescopes to determine the distance from a star to the inner rim of its surrounding protoplanetary disk. Researchers used a method called "photo-reverberation," also known as "light echoes.

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