The age of the Milky Way Galaxy has been estimated to be at least 13 billion years based on a.observations of globular clusters. b.observations of open clusters. c.21-cm radiation from HI regions. d.the rotation curve of the galaxy. e.the energy produced by Sagittarius A*.

Our Milky Way galaxy is barred spiral galaxy and it is surrounded by Halo which contains cluster of…

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	a.	observations of globular clusters.
	b.	observations of open clusters.
	c.	21-cm radiation from HI regions.
	d.	the rotation curve of the galaxy.
	e.	the energy produced by Sagittarius A*.

The age of the Milky Way Galaxy has been estimated to be at least 13 billion years based on a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from HI regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A*.