Astronomy

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What explanation does general relativity provide for gravity?

Gravity is the result of curved spacetime

In structure, our Milky Way is most similar to:

M-31, the Andromeda Galaxy

Our galaxy is the __________, which is a __________ galaxy

Milky Way, barred spiral

If a space probe could be sent into a black hole, it could transmit images back to Earth

True

If light from a distant star passes close to a massive body, the light beam will:

bend towards the star due to gravity

How do scientists know that black holes exist?

by observing objects and light around black holes

According to Hubble's Law, the greater a galaxy's redshift, the:

closer it is to us

Another student tells you that the Milky Way Galaxy is made up "mostly of stars." Is this statement accurate?

false

super-massive black holes likely exist in the center of every _______________.

galaxy

What powerful force allows black holes to absorb light?

gravity

Galaxies evolve by

merging to form larger galaxies

Which of the following can actually escape from inside a black hole's event horizon?

none of these answers

If the Sun were replaced by a black hole with the same mass:

only the temperature on Earth would be affected

The gravity of a black hole is so strong because of its small __________ and large ___________

size, mass

In the absence of dark matter, the stars most distant from the galactic center should be moving much __________________ than those stars orbiting closer to the center

slower

A galaxy containing substantial amounts of dark matter will

spin faster

Most of the new star formation in the Galaxy is found in the:

spiral arms

Galaxy distance and Doppler redshift are correlated for galaxies. What do we call that correlation?

the Hubble "law"

LIGO detected gravitational waves that probably originated from:

the merger of two black holes

As a spaceship nears an event horizon, a clock on the spaceship will be observed:

to run slowly

It is now believed the majority of mass for most galaxies lies in their dark halos

true


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