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Introducing the Solar System

Use pages 82 to 87 in your science book to answer the questions. 
Across
A ______ is a loose, icy body with a long, narrow orbit.
The solar system began to form as _______ pulled rock, ice, and gas together.
A _______ is an object that orbits a planet.
Scientists use the __________ unit to measure distances within the solar system.
A planet that formed closer to the sun than Earth but not closest to the sun is _______.
_______ is the smallest planet in the solar system.
One day is the time it takes a planet to rotate on its ________.
The four outermost planets in the sun’s orbit are mostly made of liquid and ______.
_______ is the planet farthest from the sun.
Down
______ is the largest planet in the solar system.
The sun is a(n) _______.
____, once the ninth planet in the solar system, is now considered a dwarf planet.
______ is a small rocky body that orbits the sun.
Scientists think the solar system formed about 4.6 _______ years ago.
Planetesimals collided, stuck together, and eventually combined to form all the other objects in the ________ _________.
All but two planets in the solar system have a natural satellite, or ______.
_______ is a gas giant planet that is smaller than Jupiter but larger than Neptune.
The solar system formed from a giant _____ of gas and dust.
About 99.85 percent of the mass of the solar system is contained within the ______.