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Consider the following statements with reference to the Star Clusters:
1. They are stellar assemblages held together by the mutual gravitational attraction of their members.
2. Stars in an open star cluster do not have a common origin as they are formed from different initial giant molecular clouds.
Which of the statements given above is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements with reference to the Star Clusters:...
Astronomers recently discovered five young star clusters, and possibly the oldest star clusters ever, born from the time when the Universe was an infant.
About Star Clusters:
  • A Star cluster is either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin.
  • They are particularly useful to astronomers as they provide a way to study and model stellar evolution and ages. 
  • The two basic categories of stellar clusters are open clusters, also known as galactic clusters and globular clusters.
  • Open (Galactic) Clusters:
  • Open clusters are so named because the individual component stars are easily resolved through a telescope.
  • They are sometimes called galactic clusters due to their location on the dusty spiral arms on the plane of spiral galaxies.
  • Stars in an open cluster have a common origin: they formed from the same initial giant molecular cloud.
  • Open clusters contain from a dozen to many hundreds of stars, usually in an unsymmetrical arrangement.
  • Globular Clusters:
  • Globular clusters contain several thousand to one million stars in a spherical, gravitationally-bound system. 
  • Located mostly in the halo surrounding the galactic plane, they comprise the oldest stars in the galaxy.
  • There is little free dust or gas found in globular clusters, so no new star formation is taking place in them.
  • Stellar densities within the inner regions of a globular cluster are very high compared with regions such as those around the Sun.
  • In addition, groups called associations, made up of a few dozen to hundreds of stars of similar type and common origin whose density in space is less than that of the surrounding field, are also recognized.
Hence only statement 1 is correct.
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Consider the following statements with reference to the Star Clusters:1. They are stellar assemblages held together by the mutual gravitational attraction of their members.2. Stars in an open star cluster do not have a common origin as they are formed from different initial giant molecular clouds.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'A'. Can you explain this answer?
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