Stellar Evolution

High-mass stars burn hotter & brighter because they have more _______ at their cores.

• fusion

• fuel

• energy

• pressure

Almost all stars form from nebulae at about the same time in _____.

• clouds

• galaxies

• groups

• clusters

_____ stars evolve and move off the main-sequence first; then intermediate stars & so on.

• Low-mass

• Red giant

• High-mass

• White dwarf

Since stars are born in clusters, these stars will have evolved off the main sequence first.

• pulsars

• red giants

• white dwarfs

• blue giants

What is fusion?

• It is the measure of brightness of a star.

• The process of merging atoms together to create energy.

• It is the process of analyzing stars for what atoms they contain.

• It is a description of how massive a star is.

Which of the following list the correct order of the life cycle of massive stars?

• Nebula --> protostar --> main sequence --> red supergiant --> supernova --> blackhole
• Nebula --> protostar --> main sequence --> red giant --> planetary nebula --> white dwarf --> black dwarf
• Nebula --> protostar --> main sequence --> supernova --> red giant --> blackhole
• Nebula --> protostar --> blackhole --> red supergiant --> supernova --> main sequence

Luminosity is

• The measure of brightness of a star.

• The temperature of a star.

• The mashing of atoms to create heat and light.

A flattened disk of dense gas and dust surrounding a young newly forming star is called ___

• a protoplanetary disk

• a nursery nebula

• a glowing stratum

• a laminar slice

When viewed in the infrared, what is revealed at the center of protoplanetary disks?

• supernova

• white dwarfs

• protostars

• black holes

If a star is yellow, we can conclude that...

• it is a massive star.
• it is an average star.
• it will one day become a neutron star.
• it will one day become a black hole.