components of the universe

All matter and space that exists is called the

• galaxy

• planetary system

• universe

A round and massive object that orbits around a star. They can be made of rocks, gasses, or gas and ice.

• moons

• stars

• planets

Which galaxy do we live in?

• Andromeda

• Milky Way

• Small Magellanic Cloud

• Virgo

Which answer correctly compares the masses of two objects in the universe?

• A galaxy has less mass than nebulae and more mass than a star

• A star has more mass than a planet and less mass than a galaxy

• A moon has more mass than a star and less mass than a planet

• A universe has less mass than a galaxy and more mass than a planet

A system of billions of stars, gas, and dust held together by gravity is called a-

• star

• nebula

• galaxy

• universe

Which answer choice best describes a star?

• a sphere of gas and dust 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 temperature and density great enough to cause a nuclear reaction at its center

• a collection of hot gases that produces heat but no light

Categorize this galaxy.

• irregular

• spiral

• elliptical

• crab

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular 
• Irrational

In which list are celestial features correctly shown in order of increasing size?

• galaxy, solar system, universe, planet

• solar system, galaxy, planet, universe

• planet, solar system, galaxy, universe

• universe, galaxy, solar system, planet

Which of the following describes a nebula?

• A cloud of gas and dust where new stars form

• An oval-shaped cluster of densely packed stars

• An explosion at the end of a giant star’s life

• A star and all the planets that revolve around it