Stars

• Earth's rotation

• The moon's rotation

• Earth's gravity

• The sun's gravity

• the magnetic attraction between Earth and the sun

• potential energy stored in Earth that originates in the sun

• the gravitational attraction between the sun and Earth

• electromagnetic energy from the sun pulling on Earth

What keeps planets in the solar system from moving in straight lines through the galaxy?

• light energy

• gravity

• inertia

• potential energy

In July 1994 the comet Shoemaker-Levy 9 collided with the planet Jupiter, as scientists had predicted. to be able to accurately predict when a comet will collide with a planet, it is essential to understand

• the composition of a planet's atmosphere

• the gravitational attraction that exists between all bodies

• the attraction of opposite poles of a magnet to each other

• the formation of comets

• Student 1

• Student 2

• Student 3

• Student 4

• Section 1

• Section 2

• Section 3

• Section 4

• asteroids

• comets

• planets

• stars

• Section 1

• Section 2

• Section 3

• Section 4

• Star 1

• Star 2

• Star 3

• Star 4

Which statement best describes a galaxy?

• A cloud of gas that is the birthplace of stars

• A system of billions of stars, gas, and dust held together by gravity

• A ball of plasma that experiences nuclear fusion in its core

• A mass of dust and ice that orbits a star in and elliptical pattern