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. via NASA http://go.nasa.gov/1rxkcf0
Earth Sol Milky Way Home Galaxy Local Group Virgo Supercluster Imagination Station Celestial Citadel
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