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Chapter 21 Lesson 1

Across
An object that orbits the Sun, has a spherical shape, and has a mass greater than the mass of other objects near it
The planets in the solar system are so far apart that scientists measure the distances
large spherical objects made primarily of the gases hydrogen and helium
the time it takes an object to travel around the Sun
causes planets and other space objects to revolve around the Sun rather than going off in a straight line
Object at the center of our solar system
Down
the time it takes an object to spin once
small, rocky objects that orbit the Sun between Mars and Jupiter
spherical objects made mainly of solid, rocky materials
object made of gas, dust, and ice