Components of the Universe - Nebulae, Stars & Planets

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

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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

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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

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112.20.b.8.A

A nebula is a collection of dust and _____.

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112.20.b.8.A

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

• brightbright
• big
• small
• hot
• cold

Tags

112.20.b.8.A

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

• the Sun
• Polaris
• Orion
• Sirius

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112.20.b.8.A

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

• star

• moon

• asteroid

• comet

Tags

112.20.b.8.A