Stars Nebulae and Galaxies

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 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.

In the diagram given, what happens as we move to the left?

• Stars Get Larger

• Stars get Colder

• Stars get hotter

After a supergiant, a high mass star explodes and forms a

• supernova

• red giant

• black hole

• planetary nebula

Tags

NGSS.HS-ESS1-3

A system of stars, gas, dust, and dark matter bound together by gravity is called -

• an asteroid

• a moon

• a galaxy

• a nebula

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best explains why people on Earth cannot see the entire shape of the Milky Way?

• Earth is a part of this galaxy.

• Many more stars exist outside the galaxy

• The stars in the center of the galaxy are extremely small

• The center of the galaxy consists of a dense cluster of stars

A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim, even through a telescope.

Why do other stars look much dimmer than the sun?

• The sun appear yellow, which is more visible than other colors.

• The sun is much closer to Earth than other stars are

• Other stars are made up of different gases than the sun is.

• As light from other stars travels through space, it gets reflected.

Compared to the rest of the stars, our sun is considered...

• Extremely Large and Cold

• Small with a medium temperature

• Medium size with medium temperature

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

A spiral galaxy is best described as an extremely large group of stars -

• arranged in arms encircling a dense center.

• all packed into a spherical, dense center.

• arranged in the shape of a flattened ball.

• and gases arranged in no specific shape.

Tags

NGSS.MS-ESS1-2