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Science · Earth sciences
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                Which of the following statements is true:

a.

black holes cannot be seen because they are too far away.

b.

black holes cannot be seen, but we can see the effects of their gravitational fields.

c.

None of the above.

d.

a black hole is a final stage of a low-mass star.

Which of the following correctly describes the concept of star-gas-star cycle?

a.

Stars near the center of the Milky Way are continually recycled to the outskirts of the disk by their orbital motion.  

b.

New stars are continuously being formed in the Milky Way out of gas that has been ejected from a previous generation of stars.

c.

In the formation of a star, no matter is wasted as all excess material ends up recycled into planets.

d.

Life is continuously being spread from star to star in the Milky Way.

One difference between the terms solar system and galaxy is that

a.

the solar system contains only one star but the galaxy contains many billions.

b.

other stellar system contains planets, but the galaxy does not.

c.

other stellar systems are rare, but other galaxies are common.

d.

other galaxies are rare, but other stellar systems are common.

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