Universe and Expansion

Galaxies are large groups of millions, billions, or even trillions of stars. What would you claim keeps the stars in a galaxy from moving away from each other?

• gravity

• density

• temperature

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

A light-year is the distance that light travels in one year. Based on this evidence, if a star is 3 light-year from Earth, how long does it take light from that star to reach Earth?

• 3 minutes

• 3 hours

• 3 years

During a class astronomy project, the teacher displayed a table that relates the color of a star to its surface temperature. The teacher gave Kwan a card with the following description of a star:

Star A

6,750 K

Based on evidence in the table above, what color should Kwan predict the star will be?

• red

• blue

• orange

• yellow-white

The sun is much larger than the moon. However, as viewed from Earth, the sun and moon appear to be the same size. Which reasoning explains why the the sun and moon appear to be the same size when viewed from Earth?

• The moon is much hotter than the sun.

• The moon is much closer to Earth than the sun.

• The moon is much denser than the sun.

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-3

In 1995, the Hubble Space Telescope photographed a tiny spot in the sky for a period of ten days;

342 exposures were placed together to create an image known as the Hubble Deep Field. Although the sample is tiny, it is representative of the universe, which looks similar in all directions. The image shows a collection of billions of stars. The Hubble Deep Field shows at least 3,000 groups of these stars.

• moon

• galaxy

• universe

• solar system

Tags

NGSS.MS-ESS1-2

Space exploration has advanced our knowledge of the universe. Which space journey would take the longest?

• a journey from Earth to the sun

• a journey from Earth to the moon

• a journey from Earth to a star in the constellation Centaurus

• a journey from Earth to the farthest planet in our solar system, Neptune

Tags

NGSS.MS-ESS1-3

A galaxy contains stars, gas, and dust. This matter must be held together or the galaxy will break apart. What is responsible for holding the stars, gas, and dust together in a galaxy?

• heat

• gravity

• friction

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Different types of telescopes, such as gamma-ray detectors and radio telescopes, are used in space science. What reasoning explains why?

• Different types of telescopes are needed to detect visible light.

• Different types of telescopes are needed to measure the wavelengths of radiation.

• Different types of telescopes are needed to collect data from different ranges of radiation.

• Different types of telescopes are needed to observe the same part of the electromagnetic spectrum.

Tags

NGSS.MS-PS4-2

Which of the following correctly lists the objects of space in order from largest to smallest?

• universe, galaxy, star, planet

• universe, galaxy, planet, star

• galaxy, universe, star, planet

• galaxy, universe, planet, star

Here is an image of the sun. What is the name of the object that can be seen in the circled area of the sun?

• sunspot

• solar flare

• gamma rays

• prominence