From Wired Science:
An exoplanet hidden in the Hubble Space Telescope's archival images has been revealed by data miners using a new technique for spotting the satellites of distant stars.
In search of more information about a known exoplanet orbiting the star HR8799 about 130 light-years from Earth, astronomers turned to the catalog of images Hubble has been amassing for more than 15 years. Using an algorithm that can block the bright light of observed stars allowing the much fainter exoplanets circling them to be seen, the team spotted the planet in an image from 1998.
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