Composition of the Universe

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

Which of the following best describes a star? A star is a celestial body -

• composed of rock and metal with a very high density.

• that is too big to be an asteroid, but too small to be a planet.

• that rotates on an axis and revolves around the Sun.

• composed of gases that emit light due to nuclear reactions.

Which of the following best describes a nebula? A nebula is -

• a region in the solar system that is occupied by irregularly shaped bodies

• a large and icy celestial body with an irregular orbit around the Sun.

• a natural satellite created by the collision of two large asteroids.

• an interstellar cloud of dust, hydrogen, helium and other gases.

Which of the following best describes a galaxy? A galaxy is -

• a particle of debris in the solar system that does not act as a satellite of any planet.

• a visible body of liquid or frozen crystal droplets suspended above a planetary surface

• a massive system of stars, gas, dust and dark matter bound together by gravity.

• the visible path of a meteoroid as it enters Earth’s atmosphere.

Stars are made mostly of which two elements?

• hydrogen and helium

• mercury and strontium

• iron and potassium

• krypton and bismuth

Which of the following is an accurate description of the relationship between components of the universe?

• Stars always contain galaxies.

• Galaxies contain many stars.

• Stars contain several nebulae.

• Nebulae contain many galaxies.

Which of the following components of the universe is best described a system of stars, gases, and dust held together by gravity?

• a nebula

• a planet

• a meteor

• a galaxy

Tags

NGSS.MS-ESS1-2

The stars and all the other matter in a galaxy are held together by which of the following?

• Dark matter

• Inertia

• Gravity

• Magnetism

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Which of the following components of the universe is best described as an interstellar cloud of dust and gases where stars can form?

• a nebula

• a planet

• a meteor

• a galaxy

A large celestial body made of gases that emits light due to nuclear reactions is called -

• a galaxy

• a nebula

• a comet

• a star