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Messier 87 has swallowed an entire galaxy in the last billion years

26 June 2015 Astronomy Now

M87 is a giant elliptical galaxy with a total mass more than a million million times that of the Sun that lies at the centre of the Virgo Cluster about 50 million light-years away. New observations with the European Southern Observatory’s Very Large Telescope have revealed the full extent of the galaxy’s cannibalistic nature.

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Monster black hole wakes up after 26 years

26 June 2015 Astronomy Now

On 15 June 2015, a long-time acquaintance of X-ray and gamma ray astronomers made its comeback to the cosmic stage: V404 Cygni, a system comprising a black hole and a star orbiting one another. It is located in our Milky Way galaxy, almost 8,000 light-years away in the constellation Cygnus, the Swan.

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Global Asteroid Day events and webcasts set for June 30

25 June 2015 Astronomy Now

The first official Asteroid Day is on 30 June with premiere events in London and San Francisco, but local organisers are making final preparations for more than 50 public events worldwide to increase education and awareness about asteroids and how to better detect them.

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The mysterious ‘lakes’ on Saturn’s moon Titan

21 June 2015 Astronomy Now

Titan is home to seas and lakes filled with liquid hydrocarbons, but what forms the depressions on the surface? A new study using data from the joint NASA and European Space Agency (ESA) Cassini mission suggests the moon’s surface dissolves in a process that’s similar to the creation of sinkholes on Earth.