1. Messier 7Messier 7 or M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster, is an open cluster of stars in the constellation of Scorpius. The cluster is easily detectable with the naked eye, close to the "stinger" of Scorpius. M7 has been known since antiquity; it was first recorded by the 1st-century Greek-Roman astronomer Ptolemy, who described it as a nebula in 130 AD. Italian astronomer Giovanni Batista Hodierna observed it before 1654 and counted 30 stars in it.
Read “Messier 7” on English Wikipedia
Read “M7” on Japanese Wikipedia
Read “Messier 7” on DBpedia
Read “Messier 7” on English Wikipedia
Read “M7” on Japanese Wikipedia
Read “Messier 7” on DBpedia
Discussions
Log in to talk about this word.