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Galaxies and star clusters are collections of stars held together by gravity. Galaxies are really big. But how big is big? Even bigger than a million stars? Yes, a million is small in astronomy.

Galaxy or Star Cluster

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There are lots of stars in clusters, so why are most of the planets found orbiting single stars? It looks as though the planets are there, but are faint and very hard to detect. A group of astronomers studied 88 stars in the cluster Messier 67 over a period of six years. They found three planets, including one around a star that's practically the Sun's identical twin. Even using one of the world's most sensitive instruments, they found these planets at the limits of what was detectable.

Artist's impression of Sun's twin with planet

Last edited by Mona - Astronomy; 08/18/18 05:54 PM. Reason: upgraded link
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“Many a night I saw the Pleiads, rising thro’ the mellow shade
Glitter like a swarm of fireflies tangled in a silver braid.”
- Alfred Lord Tennyson, from Locksley Hall


Not many star clusters get mentioned in poems . . . especially by classic English poets. But the Pleiades are a beautiful cluster rich in folklore. Here is a splendid picture of the Pleiades by Jacob von Chorus - the Young Astronomy Photographer of the Year 2012

Last edited by Mona - Astronomy; 08/18/18 05:52 PM. Reason: upgraded link

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