Fact Sheet
Planet Rubble
A giant planet orbits through a disk of rubble -- from fine grains of dust to mountain-sized boulders -- in this artist's concept. Astronomers reported last week that two orbiting observatories, Hubble Space Telescope and Spitzer Space Telescope, have found evidence of such systems orbiting mature Sun-like stars. Previously, astronomers had discovered systems with planets or systems with debris disks, but not clear evidence of both. [Credit: NASA/JPL/T. Pyle (SSC)]
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