A RARE collision of two stars may explain a weird cosmic outburst.
In 2002, a star called V838 Monocerotis brightened dramatically. Some researchers have suggested that a collision with another star produced the fireworks, while others have argued that the star simply "burped" after swallowing some planet-sized objects.
Now observations of X-rays from the star's vicinity by a team led by Fabio Antonini of the Rochester Institute of Technology in New York suggest the star is spinning rapidly (arxiv.org/abs/0910.0503). This fits with a prediction by another group in 2006 that an off-centre collision between stars could leave a rapidly rotating red giant that produces such X-rays.
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