Low Mass Stars

Very roughly speaking, we can divide stars into two groups: ___

• low mass stars, and high mass stars
• bright stars and dim stars
• dwarfs and giants
• low mass stars, and super-giants

The dividing line between low mass stars and high mass stars lies around ___

• half the mass of the Sun
• twice the mass of the Sun
• eight times the mass of the Sun
• 80 times the mass of the Sun

During the fusion of hydrogen, four protons, plus some other ingredients, get turned into ___

• four neutrons
• four photons
• one helium nucleus
• one lithium nucleus

A higher mass star squeezes hydrogen harder, so ___

• it fuses more slowly
• it fuses more quickly
• it fuses into lithium
• it fuses into deuterium

For a star, the lower its mass, ___

• the larger its apparent magnitude
• the brighter it is
• the shorter it lives
• the longer it lives

How long can a really low mass red dwarf last?

• a thousand years
• a million years
• a billion years
• a trillion years

When a low mass red dwarf dies, it will be nearly pure ___

• hydrogen
• helium
• lithium
• deuterium

With stars like the Sun, the material in the core ___

• stays in the core
• convects to the radiative zone
• mixes with the convective zone
• convects to the surface

What is the total life span of the Sun?

• about two million years
• about twelve million years
• about two billion years
• about twelve billion years

The Sun's cores is getting ___ 

• less dense and hotter
• less dense and cooler
• denser and hotter
• denser and cooler