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Gaia science alerts are back

While scanning the sky to measure the position and velocity of a billion stars, ESA's Gaia satellite also records many 'guest stars' – astronomical sources that, for a short period of time, are much brighter than usual.

dateMar 08, 2016 in Astronomy
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Hubble image: The sleeping giant

The placid appearance of NGC 4889 can fool the unsuspecting observer. But the elliptical galaxy, pictured in this new image from the NASA/ESA Hubble Space Telescope, harbours a dark secret. At its heart lurks one of the most ...

dateFeb 11, 2016 in Astronomy
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