Chandra X-ray Observatory - Learn About the Milky Way [HD]

video about telescope

	Chandra X-ray Observatory - Learn About the Milky Way [HD] The word galaxy comes from the Greek word meaning "milky circle" or, more familiarly, "milky way." The white band of light across the night sky that we call the Milky Way was poetically described long before Galileo. But with his small telescope, what he discovered was a multitude of individual stars, "so numerous as almost to surpass belief." Today we know that the Milky Way is our home galaxy—a vast rotating spiral of gas, dust, and hundreds of billions of stars. The Sun and its planetary system formed in the outer reaches of the Milky Way about 4.5 billion years ago. In the center of the galaxy is the bar-shaped galactic bulge which harbors a supermassive black hole with a mass equal to that of about 3 million suns. Surrounding the central bulge is a relatively thin disk of stars about two thousand light years thick and roughly 100000 light years across. Almost all the stars seen by the human eye are in the thin disk, which accounts for about 90% of the visible light in the Milky Way. Read more: chandra.harvard.edu	From: TheMarsUnderground Views: 12 2 ratings
	Time: 01:32	More in Science & Technology

telescope