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Explanation: To the eye, this cosmic
composition nicely balances the Bubble Nebula at the lower left with open star
cluster M52 above it and to the right. The pair would be lopsided on other scales,
though. Embedded in a complex of interstellar dust and gas and blown by the
winds from a single, massive O-type star, the Bubble Nebula, also known as NGC
7635, is a mere 10 light-years wide. On the other hand, M52 is a rich open
cluster of around a thousand stars. The cluster is about 25 light-years across.
Seen toward the northern boundary of Cassiopeia, distance estimates for the
Bubble Nebula and associated cloud complex are around 11,000 light-years, while
star cluster M52 lies nearly 5,000 light-years away. The wide telescopic field
of view spans about two degrees on the sky or four times the apparent size of
the Full Moon.
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