Science Unit 5 Lesson 4

A scientist is comparing two stars that appear equally large and bright in the night sky. The scientist identifies the name of one of the stars, which is Megrez.

Which statements about the second star could be true? (Two correct answers)

• The star burns more dimly than Megrez, but is closer to Earth.

• The star burns more dimly than Megrez and is farther away from Earth.

• The star burns more brightly than Megrez, but is farther away from Earth.

• The star burns more brightly than Megrez and is much closer to Earth.

Why does the sun appear so much larger and brighter than the other stars that are seen from Earth?

• Other stars burn very dimly.

• Other stars are very small.

• Other stars are very far away from Earth.

• Other stars appear only at night.

Why does the sun appear so much larger and brighter than the other stars that are seen from Earth?

• The sun appears only during the daytime.

• The sun is much larger than other stars.

• The sun burns more brightly than other stars.

• The sun is closer to Earth than other stars.

Which statement about the distance between the stars and the Earth is true?

• Some stars are far away from Earth, while others are as close as the clouds.

• Although all stars other than the sun are far away from Earth, some are closer than others.

• Compared to the sun, most stars are about twice as far away from Earth.

• Compared to the sun, most stars are about half as far away from Earth.

Which statement about the distance between the stars and the Earth is true?

• Some stars are closer to Earth than other stars, although all stars other than the sun are very far away.

• Some stars are as close as clouds, while others are farther away.

• Compared to the sun, most stars are about three times farther from Earth.

• Compared to the sun, most stars are about three times closer to Earth.

Which statement about the distance between the stars and the Earth is true?

• Many stars are as close as clouds, while others are farther away.

• Compared to the sun, most stars are about four times farther from Earth.

• The distances to stars range from a few light-years to much greater.

• Compared to the sun, most stars are about twice as close to Earth.

The sun is much closer to Earth than other stars.

• True
• False

The sun is the only yellow star.

• True
• False

Which process occurs inside of a star that causes it to release heat and light?

• nuclear fusion, typically involving hydrogen nuclei

• combustion reactions, such as the burning of fossil fuels

• radioactive decay, such as the decay of uranium atoms

• photosynthesis, which is also performed by plants on Earth

Which process produces the heat and light of a star?

• radioactive decay, such as the decay of uranium atoms

• photosynthesis, which is also performed by plants on Earth

• nuclear fusion, typically involving hydrogen nuclei

• combustion reactions, such as the burning of fossil fuels