6th EMBRACE Unit 1 Review

Which statement about the universe is NOT correct?

• Each galaxy contains billions of stars.

• The universe contains billions of galaxies.

• You may not see all stars with the naked eye.

• Each solar system contains billions of galaxies.

Which of these is NOT large and gaseous?

• Jupiter

• Mercury

• Saturn

• Uranus

Evidence shows that interstellar bodies are moving away from Earth, some faster than others, which BEST suggests that the universe

• is shrinking.

• is expanding

• was not formed by a big bang.

• has always been the same size.

If the four components were ranked from smallest to largest, what would the order be?

• planet; solar system; galaxy; universe

• planet; galaxy; solar system; universe

• universe; galaxy; solar system; planet

• solar system; galaxy; planet; universe

A meteorite is DIFFERENT from a comet mainly because it

• has a tail of ice and dust.

• enters the Earth’s atmosphere.

• has a nucleus made of snow and rock.

• is found in orbit between Mars and Jupiter.

The images in the picture are particles of debris that are sometimes called shooting stars. They are

• interplanetary dust.

• asteroids.

• meteors.

• comets.

Earth has several ideal features which enable it to support life. MOST important is the

• gravitational force on Earth.

• existence of tectonic plates

• relationship between Earth and its moon.

• existence and amount of water on Earth's surface.

Why does Earth orbit the Sun rather than any other body in the solar system?

• The mutual repulsions among all the planets hold Earth in its orbit.

• The Earth is closer to the Sun than other bodies in the solar system.

• The Sun is the most massive object; gravitational attraction is related to mass.

• The rotational motions of all the planets, including Earth, cause them to remain in its orbit around the Sun.

Which planet in the solar system has a significant ring system?

• Mars

• Mercury

• Saturn

• Venus

The Earth revolves around the sun once per year, in a stable orbit.

What is it that keeps the Earth in this orbit?

• Gravity

• The moon

• Sunlight

• Rotation