We now think that a supermassive black hole is at the center of our Galaxy based

ID: 1472828 • Letter: W

Question

We now think that a supermassive black hole is at the center of our Galaxy based on

A. observations of matter orbiting the Galactic center at large speeds

B. observations of matter moving toward the Galactic center at large speeds

C. photographs of the region close to the Galactic center taken at visible wavelengths

D. bright X-ray emissions from the Galactic center

Population I stars can be found

A. in the halo of our Galaxy

B. everywhere in our Galaxy

C. only at the Galactic center

D. in the disk and spiral arms of our Galaxy

As seen from Earth, the center of the Galaxy is located in the constellation

A. Ursa Major

B. Gemini

C. Orion

D. Sagittarius

The source of the energy that comes from the Galactic nucleus seems to be due to

A. nuclear reactions in the great numbers of stars there

B. collisions between stars there

C. matter falling into a giant black hole there

D. heat still retained there from the original formation of the Galaxy

The spiral arms of the Galaxy

A. lie closer to the center than the Sun, but not farther

B. lie farther from the center than the Sun, but not closer

C. are found both inside and outside the Sun’s orbit

D. [The answer is not known.]

A. observations of matter orbiting the Galactic center at large speeds

D. in the disk and spiral arms of our Galaxy

D. Sagittarius

C. matter falling into a giant black hole there

B. lie farther from the center than the Sun, but not closer

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