QUESTION 1 Which of the following statements is true:black holes cannot be seen because they are too far away.a black hole is a final stage of a...

QUESTION 1

1. Which of the following statements is true:

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

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

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

d.None of the above.

Which types of galaxies have a clearly defined disk component?

a..Ellipticals and irregulars.

b.Ellipticals.

c.Irregulars

d.Spirals.

1. What is the electromagnetic spectrum?

a.Radiation, some of which is dangerous, and some of which is harmless.

b.Light of all different energies.

c.All of the above.

d.Light of all different wavelengths.

4 points  

1. Which travels fastest in space?

a.Radio waves.

b.X rays.

c.They all travel at the same speed in space

d.Visible.