Science--Chapter 4C Movements In the Solar System

Chapter 4C Movements in the Solar System


1. What are the effects of Earth’s movements?

            One rotation of Earth on its axis is one day, and one revolution around the sun is one year.

The tilt of Earth and Earth’s revolving around the sun cause seasonal differences in the northern and southern parts of Earth.

2. What are the effects of the moon’s movement?

            As the moon revolves around Earth, different amounts of the half of the moon facing Earth are lit.

            A lunar eclipse occurs when Earth passes between the sun and the moon, and a solar eclipse occurs when the moon passes between the sun and Earth.

3. How does earth compare with other planets?

All nine planets are satellites of the sun and reflect light from the sun , but Earth is the only planet that can support life such as that found on Earth.

The orbits of the planets are ellipses.

Scientists have learned about neighboring planets’ surfaces, atmospheres, and water.

4. What have scientists learned about distant planets?

            The Galileo mission provided information about the lack of water on Jupiter and about its strong winds and lightning.

            The Voyager mission provided information about the rings of Saturn and Uranus.

            Scientists have recently discovered Neptune’s large, dark spots and that is rings are complete. The Hubble Telescope has taken pictures of Pluto.

5. What other objects are seen in the solar system?

            Asteroids are rocky objects that orbit the sun, mostly between the orbits of Mars and Jupiter; meteors are pieces of rock or dust burning up in Earth’s air.

            The orbits of comets are longer and flatter than those of planets.

            The stars, like our sun, make their own light and stay in one place.





Axis                 an imaginary line through a spinning object

Rotation           one full spin of an object around an axis

Orbit                the path of an object around another object

Revolution        the movement of an object around another object

Satellite            an object that revolves around another object

Solar system     the sun, the nine planets and their moons, and other objects that orbit the sun

Ellipse              the shape of a flattened circle

Asteroid           a rocky object orbiting the sun between the plants

Meteor             piece of rock or dust from space burning up in Earth’s air

Meteorite         a rock from space that has passed through Earth’s air and landed on the ground

Comet              a frozen chunk of ice and dust that orbits the sun

Constellation     a group of stars that form a pattern