With Valentine's Day approaching, romance is in the air -- way, way up in the air. It's not just humans who like to show their affection. So do cosmic bodies. Located in the constellation of Cassiopeia in the Perseus arm of the Milky Way galaxy and some 7,500 light-years from Earth is IC 1805, aka the Heart Nebula.

The reason for this name should be obvious: its two swooping wings resemble the shape of a heart, and it glows red from within -- classifying it as an emission nebula -- from hydrogen ionised into plasma by nearby stars. The cluster of very young, hot stars -- just 1.5 million years old -- in the centre of the nebula is known as Melotte 15. The nebula itself spans some 200 light-years across.

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