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The Solar System Test Review

Across
Earth is thought to be at the center of the solar system in the _______ model.
Small asteroid-like bodies that became the building blocks for the planets are called _________.
The solar wind is a stream of electrically charged particles that extend outward from the sun’s ________.
Most comets are found in the ______ ______.
The sun’s ______ layer is the photosphere.
The number of sunspots on the sun varies over a period of about ______ years.
The _____ _______ all are small and have rocky surfaces
Most ancient astronomers thought that all celestial objects revolved around _______.
Down
The heliocentric system gained support when Galileo observed that ______ goes through phases similar to those of Earth’s moon.
Mars’s atmosphere is mostly ______ ______.
The ______ _______ are much larger than Earth and are made mainly of hydrogen and helium.
The sun produces energy by _______.
All of the ____ ______ planets have many moons.
When looking at at an image of the sun you are looking at the ______.
The fact that each planet’s orbit is an ellipse was discovered by __________.
A meteoroid that hits Earth’s surface is called a(n) __________.
Jupiter’s Great Red Spot is a(n) _______ larger than Earth.
The solar system formed from a giant _____ of gas and dust.
The ______ ______ consists of the sun, eight planets and their moons, and several kinds of smaller objects.
In a heliocentric system, Earth revolves around the _____.