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- 1. Multiple Choice
Galaxies are large groups of millions, billions, or even trillions of stars. What keeps the stars in a galaxy from moving away from each other?
gravity
density
composition
temperature
- 2. Multiple Choice
A light-year (ly) is the distance light travels in one year. If a star is 3 ly away from Earth, how long does it take the star's light to travel far enough to reach Earth?
3 minutes
3 hours
3 years
3 light years
- 3. Multiple Choice
Celestial bodies can be classified based on their sizes. Which of the following is listed from largest to smallest?
a planet, the Sun, a supergiant, a red giant
a supergiant, a red giant, the Sun, a planet
the Sun, a supergiant, a red giant, a planet
a supergiant, a red giant, a planet, the Sun
- 4. Multiple Choice
In 1995, the Hubble Space Telescope photographed a tiny spot in the sky for a period of 10 days; 342 exposures were placed together to create an image known as the Hubble Deep Field. Although the sample is relatively small, 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 3000 groups of these stars. Which term describes these groups of stars?
planet
universe
galaxy
solar system
- 5. Multiple Choice
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 the farthest planet in our solar system, Neptune
a journey from Earth to the constellation Centaurus
- 6. Multiple Choice
A galaxy contains large collections of stars, planets, gas, and dust. What is responsible for holding the stars, gas, and dust together in a galaxy?
heat
light
gravity
friction
- 7. Multiple Choice
One way to compare bodies in space is by their relative sizes. Which of the following is larger than a galaxy?
the universe
a planet
a star
a solar system
- 8. Multiple Choice
If you are measuring the distance between Earth and Neptune which would be the best unit to measure in and why?
astronomical unit, because it's within the same galaxy
astronomical unit, because it's within the same solar system
light year, because it's within the same galaxy
light year, because it's within the same solar system
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