1. each planet revolves around the sun in an orbit shaped like an ellipse, a slightly flattened...
TRANSCRIPT
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Chapter 8Lesson 3
The Solar System
Pgs. 212-221
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1. Each planet revolves around the Sun in an orbit shaped like an ellipse, a slightly flattened
circle.
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2. Newton discovered that the balance between gravity and inertia keeps the planets in
orbit.
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3. In the 1500s, Copernicus proposed that the planets revolve around the Sun.
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4. Telescopes make faraway objects seem closer.
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5. In the 1960s, rockets from NASA took astronauts into
space.
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6. The United States worked with other countries to build the
International Space Station, which can stay in space for a
long time.
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7. An unmanned spacecraft that carries data-recording
equipment into space is called a probe.
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8. Earth, Mars, Mercury, and Venus are closest to the Sun and
are called the rocky planets.
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9. The atmosphere of Venus is made of carbon dioxide.
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10. The four outer planets lie beyond Mars.
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11. All of the outer planets are made mostly of hydrogen and
helium.
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12. The largest planet is Jupiter, and the next-largest is Saturn.
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13. When comets get close to the Sun, they form a tail.
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14. Most asteroids lie in a belt between Mars and Jupiter.
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Smaller planets are called dwarf planets. Most are round and made of rock and ice. Their
orbits cross the orbits of other objects.