Pleiades and Star Clusters

The video tutorial explores star clusters, which are groups of stars bound by gravity. It distinguishes between two types: globular clusters, which are dense and ancient, and open clusters, which are less dense and younger. Examples include the Pleiades (M45), an open cluster, and M4, a globular cluster. The video also discusses the characteristics, formation, and evolution of these clusters, providing insights into their role in the galaxy.

What is the primary characteristic that defines a star cluster?

• They are groups of stars that are gravitationally bound together.

• They are groups of stars that are randomly scattered.

• They are groups of stars that are not bound by gravity.

• They are groups of stars that are always the same age.

Which type of star cluster is known for having densely packed old stars?

• Globular clusters

• Nebula clusters

• Spiral clusters

• Open clusters

How old can globular clusters be?

• 12 to 13 billion years

• 1 to 2 billion years

• 20 to 21 billion years

• 5 to 6 billion years

What is a key feature of open clusters?

• They contain only old stars.

• They are densely packed.

• They are star-forming regions.

• They orbit around galaxies.

Why do open clusters disperse over time?

• They are tightly gravitationally bound.

• They are less densely packed and less tightly bound.

• They are too far from the galaxy center.

• They are made of only old stars.

What is the Pleiades also known as?

• The Big Dipper

• The Seven Sisters

• The Little Dipper

• The Orion Belt

How many stars are confirmed in the Pleiades cluster?

• Over a thousand

• Exactly seven

• About 500

• Less than 100

What is the distance of M4 from Earth?

• 6,700 light years

• 450 light years

• 75 light years

• 10,000 light years

What is the mass of M4 in solar masses?

• 67,000 solar masses

• 500 solar masses

• 10,000 solar masses

• 150,000 solar masses

What is required to see more details of M4?

• A telescope with a 6-inch aperture

• A telescope with a 2-inch aperture

• No telescope is needed

• A telescope with a 10-inch aperture