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FLASH OF LIGHT  Type 1a supernovas, such as the one seen in this Hubble Space Telescope image, can be triggered in at least two different ways, new research shows.

four quasars

QUADRUPLETS  Four quasars (marked with arrows) lie within a nebula (blue) that stretches 1 million light-years across in this false color image.

Andromeda galaxy

LIVING IN A BUBBLE  The Andromeda galaxy, the closest spiral to the Milky Way, is embedded in a tenuous bubble of gas that extends halfway to our galaxy.

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