Astronomy

Stars that produce energy from hydrogen fusion are

Match star with stellar end-point

Which objects could be associated with the evolution of a high-mass star?

An astronaut who fell into a black hole would be stretched because:

If the Sun collapsed to a black hole today, how would it affect the Earth?

Which type of galaxies appear to have many young stars

Do disk galaxies have old stars

Which type of galaxies are more likely to show evidence of dust

If a galaxy is experiencing active star formation, it must contain:

Which type of galaxies have cool, dense gas available for star formation?

Which type of galaxy shows evidence of significant numbers of O-stars and M-stars?

Which type of galaxy is likely to contain many M-stars but few O-stars?

Imagine 3 widely separated galaxies arranged in a line. If you are in the first galaxy (1) you observe that both the middle (2) and the right galaxies (3) are moving away from you. If you asked observers in galaxy number 3 how galaxy number 2 appeared to move, what would they say?

Astronomers observe two galaxies, A and B. Galaxy A has a recessional velocity of 1000 km/s, while galaxy B has a recessional velocity of 2000 km/s. This means that:

The center of the universe:

Why aren't the Milky Way, the Solar System and even the Earth ripped apart due to the expansion of the Universe?

If the universe were not expanding, the relationship between the velocity of a galaxy and its distance would:

The Hubble constant is found from the,

A universe that had a greater Hubble constant would,

A universe that expanded quicker than ours would be,

Which of the following is evidence for the existence of dark matter?

It has been shown from recent observations that the universe is not only expanding but that the expansion is accelerating! Which of the following is believed to be responsible for the acceleration?

Observations of which of the following objects revealed the accelerated expansion of the universe?

Which of the following are moving apart due to the expansion of the universe?

How is the motion of galaxies in our local group different from what we observe for distant galaxies?

Which of the following will determine if the universe will expand forever?

Over time the universe has become

Observations of the cosmic microwave background option have given us the following current composition of the universe: 5% normal matter, 23% dark matter, and 72% dark energy. How was the composition of the early universe different?