Question

Which of the following statements regarding star clusters is not true?

	The Pleiades (Seven Sisters) is an example of an open cluster.
	Globular clusters contain more stars than open clusters and associations.
	Associations of stars extend over larger distances than open clusters.
	Associations contain mainly older stars.

Answer 1

The option which is not correct is (4) Associations contain mainly older stars.

The Pleiades (Seven Sisters) is an example of an open cluster.

Globular clusters contain more stars than open clusters and associations. Globular clusters are roughly spherical groupings of from 10,000 to several million stars while Open clusters usually contain up to a few hundred members.

Stellar associations vary in size but tend to be large. Those near the Sun measure roughly 100 to 200 light-years in diameter, while those elsewhere in the galaxy typically extend about 700 light-years across. While the star clusters packed into 10 to 30 light years.

Globular clusters contain groups of hundreds to millions of old stars.