Much like Disk Detective, Galaxy Zoo contains millions of images collected
from various telescopes, including Hubble.
Despite this prediction, researchers combed through the data archives
of various telescopes (including Fermi) to hunt for any signs of light emissions from the region to which LIGO traced the two black holes.
By comparing data captured
by various telescopes in 2004, 2007 and this year, Marois's group selected three objects, all estimated to be below the brown dwarf threshold, orbiting HR 8799.
Combining images from
the various telescopes, an international team found that the asteroid varies in brightness by a factor of about 10 every 7.3 hours, matching its spin about its axis.
Previous studies using data from NASA's Galileo spacecraft, and
various telescopes, attributed the discolorations on Europa's surface to compounds containing sulfur and magnesium.