When will a neutron star collapse to a black hole?

Neutron stars are the most extreme and fascinating objects known to exist in our universe: Such a star has a mass that is up to twice that of the sun but a radius of only a dozen kilometres: hence it has an enormous density, ...

Scientists solve riddle of celestial archaeology

A decades old space mystery has been solved by an international team of astronomers led by Professor Martin Barstow of the University of Leicester and President-elect of the Royal Astronomical Society.

The first galaxies were even more violent than expected

An international team of researchers has shown that the hot diffuse gas that fills the space between the galaxies has the same concentration of iron in all galaxy clusters that were studied in sufficient detail by the Japanese ...

Mercury rising: planet completes rare transit of Sun

Astronomers celebrated Monday witnessing one of the highlights of the skywatchers' year, when the Sun, Mercury and Earth all lined up—a phenomenon that happens just a dozen or so times per century.

Predicting planets: The highs and lows

In the mid-19th century, astronomers hypothesised an extra planet in our solar system, orbiting between the Sun and Mercury.

Rosetta captures comet outburst

In unprecedented observations made earlier this year, Rosetta unexpectedly captured a dramatic comet outburst that may have been triggered by a landslide.

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