PRACTICE QUESTION

Q. Which of the following statements is/are correct?

a)    Galaxy Clusters contain 100 to 1,000 galaxies, hot X-ray emitting gas and large amounts of dark matter.

b)    The spread of velocities for the individual galaxies is about 800–1000 km/s.

c)     Jellyfish galaxies have ‘tentacles’ or tendrils of gas and dust that can trail behind the galaxies for over 300,000 lightyears.

d)    Star formation takes place in the tendrils of the jellyfish galaxies.

I. Only a and b

II. Only b and d

III. All the statements are correct.

IV. Non iof the above.

Answer: Option III. All the statements are correct.