STARS

Which statement about stars is correct?

• Star formation begins in a nebula

• White dwarfs become main-sequence stars when they gain mass

• Supergiants are stars that can absorb black holes

• Main-sequence stars are formed by comets

Tags

112.20.b.8.A

The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?

• Planets, stars, galaxies, nebulae

• Nebulae, stars, planets, galaxies

• Galaxies, stars, planets, nebulae

• Planets, stars, nebulae, galaxies

Tags

112.20.b.8.A

Which statement best describes a nebula?

• A collection of hot gases that sometimes produces light from nuclear reactions

• A collection of hot gases that results from stars that have exploded

• A collection of dust and gases that forms stars or results from dying stars

• A collection of dust and gases that is found near stars

Tags

112.20.b.8.A

Which statement correctly describes a star?

• A sphere of dust and gases that contains many elements and produces light from fusion and fission reactions

• A collection of gases from several nebulae hot enough to cause a nuclear reaction

• A sphere of matter with a density and a temperature great enough to cause a nuclear reaction at its center

• A collection of hot gases that forms a sphere but produces no light

Tags

112.20.b.8.A

A nebula forms when stars ​ (a)   , and it's where ​ new ​ (b)   are formed.

• die
• stars

Tags

112.20.b.8.A

A nebula is a collection of dust and _____.

Tags

112.20.b.8.A

A star's luminosity is how ​ (a)   it is.

• bright
• big
• small
• hot
• cold

Tags

112.20.b.8.A

The closest star to the Earth is ​ (a)   .

• the Sun
• Polaris
• Orion
• Sirius

Tags

112.20.b.8.A

A planet is a celestial body that orbits a...

• star

• moon

• asteroid

• comet

Tags

112.20.b.8.A

A supernova is the explosion of a dying:

• medium-mass star

• high-mass star

• protostar

• low-mass star