In a heliocentric system, Earth revolves around

The fact the each planet's orbit is an ellipse was discovered by

Small asteroid-like bodies that became the building blocks for the planets

What layer are you looking at when you look at an image of the sun?

The solar wind is a stream of electrically charged particles that extend outward from the sun’s ________.

What do the four outer planets have in common?

What do all of the inner planets have in common?

Most ancient astronomers thought that all celestial objects revolved around

The _________________________ consists of the sun, eight planets and their moons, and several kinds of smaller objects.

Jupiter’s Great Red Spot is a(n) _________________________ larger than Earth.

A meteoroid that hits Earth’s surface is called a(n) ____________________.

Which set of planets are in the correct order?

The region of the solar system between Mars and Jupiter is the

_________ are loose collections of ice, dust, and small rocky particles.

One _______ _______ equals the average distance between Earth and the sun, about 150,000,000 kilometers.

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