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Words related to aculeus

a stiff sharp-pointed plant process

a sharp-pointed process especially a sting of a hymenopterous insect

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Caption: You may be able to spot the Butterfly Cluster with your naked eye if you're under dark enough skies, but this cluster really sparkles with binoculars or a small scope.
splashy open cluster Messier 6, the Butterfly Cluster.
The other is M6, which only needs low telescopic power to show why it is sometimes called the Butterfly Cluster.
M6, known as the Butterfly Cluster, contains many blue stars plus a prominent orange star in its eastern "wing.
Nicknamed the Butterfly Cluster, binoculars show an attractive grouping of 30 or so stars, with a dense central region from which the "wings" spread.