Understanding Stars and Solar Systems

A star is

• A luminous body in space made of gas and plasma.

• A small, dark object in space.

• A type of terrestrial planet.
• A collection of gas and dust in space.

The Sun and other stars

• Other stars are made entirely of gas and do not produce energy.
• The Sun is a planet that orbits the Earth.
• The Sun is the only star in the universe.
• Give off their own light.

Our Sun appears brighter and bigger because

• The Sun is made of solid materials unlike other stars.
• The Sun is closer to Earth than other stars.
• The Sun is a planet that reflects light from other stars.
• The Sun is the largest star in the universe.

A solar system is

• A collection of planets orbiting a star.

• A collection of asteroids in deep space.
• A single planet orbiting a moon.
• A group of stars in a galaxy.

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A galaxy is

• A collection of many solar system.

• A small cluster of stars orbiting a planet.
• A type of celestial body that emits light.
• A collection of planets and moons in a solar system.

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The universe is

• the totality of space, time, matter, and energy
• a collection of stars
• the center of the solar system
• a type of galaxy

What is plasma?

• Plasma is a liquid found in the ocean.
• Plasma is a type of solid matter.
• Plasma is a gas that does not conduct electricity.
• Plasma is the fourth state of matter. It is superheated matter.

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Stars give off energy in the form of

• heat

• sound

• light

• radiation

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Stars have a life cycle. True or False?

• True

• False

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The Sun is composed of mostly burning

• carbon and nitrogen
• oxygen and argon
• iron and magnesium
• hydrogen