Question

Fill in the blank. A massive body can bend the path of a beam of light as it travels through space; it causes light to travel on a _______ path rather than along a straight line. Light waves compress as an object is moving toward an observer, causing the light to shift to the _______ end of the electromagnetic spectrum. Black holes can't be observed directly because they don't produce _______, so the location is identified by examining the motion of nearby stars. Even less understood than dark energy is dark _______, making up 27 percent of matter in the universe and cannot be observed with light. Holding the Milky Way together is accomplished by the _______ provided by a supermassive black hole near the center of the galactic bulge. Respond to the following based on your reading. Explain why the galactic disk appears blue and the galactic bulge appears red.

Answer 1

curved

blue

light

matter

gravity

The type of stars in the areas give different colors to the galactic disk. The galactic disk appears blue because it has a large proportion of young, hot, main-sequence stars. The galactic bulge appears red because it contains many red giants and supergiants. The reddish hue of the galactic bulge indicates that new stars aren't being formed there.

Step-by-step explanation:

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Answer 2

curved

blue

light

matter

gravity

The type of stars in the areas give different colors to the galactic disk. The galactic disk appears blue because it has a large proportion of young, hot, main-sequence stars. The galactic bulge appears red because it contains many red giants and supergiants. The reddish hue of the galactic bulge indicates that new stars aren't being formed there.

Step-by-step explanation: