Deck 62: Main-Sequence Stars

Question 1

Stars with a core temperature in excess of 20 million K probably have this hydrogen fusion type:

A) proton-proton
B) helium
C) iron
D) CNO

Answer 1

CNO

Question 2

The sun is expected to live about ____ years.

A) 10 million
B) 10 trillion
C) 10 billion
D) 10 thousand

Answer 2

10 billion

Question 3

Stars with less than about 0.4 times the mass of the Sun are probably

A) fully functional.
B) fully convective.
C) fully radiative.
D) convective only in the core.

Answer 3

fully convective.

Question 4

The stars with the shortest main sequence lifetimes will be

A) stars like the Sun.
B) the lowest mass stars.
C) the highest mass stars.
D) the coolest stars.

Question 5

The sun uses the _______ cycle to create most of its energy.

Question 6

The balance between gravity and outward radiation pressure is called ______.

Question 7

Very massive stars live relatively short lives.

Question 8

The Earth's history shows temperature has remained stable due to constant increases in greenhouses gases.