Question

Question 1)

When does a protostar become a true star?

Select one:

a. when the star is 1 million years old

b. when the central temperature reaches 1 million Kelvin

c. when nuclear fusion begins in the core

d. when the thermal energy becomes trapped in the center

Question 2:

On average, what is the greatest mass a newborn star can have?

Select one:

a. 10 solar masses

b. 50 solar masses

c. 150 solar masses

d. 300 solar masses

Question 3:

The surface of a protostar radiates energy while its core

Select one:

a. shrinks and cools.

b. shrinks and maintains a constant temperature.

c. shrinks and heats.

d. expands and cools.

Question 4:

What do we mean by the interstellar medium?

Select one:

a. The gas and dust that lies in between the stars in the Milky Way Galaxy.

b. The dust that fills the halo of the Milky Way Galaxy.

c. The middle section of the Milky Way Galaxy.

d. The name of an oracle who can channel messages from beings that live near the star called Vega.

Question 5:

The typical density and temperature of molecular clouds are

Select one:

a. 100 molecules per cubic centimeter, 10-30 Kelvin.

b. 300 molecules per cubic centimeter, 10-30 Kelvin.

c. 1000 molecules per cubic centimeter, 10-30 Kelvin.

d. 100 molecules per cubic centimeter, 100-300 Kelvin.

Answer 1

Answer1) c. when nuclear fusion begins in the core

2)c. 150 solar masses

3)c. shrinks and heats.

4)a. The gas and dust that lies in between the stars in the Milky Way Galaxy.

5)b. 300 molecules per cubic centimeter, 10-30 Kelvin.