Earth, Moon, and Sun.
By: Declan Swope
Section 1: Earth in Space.
How does Earth move in space?
Earth moves in space with two major ways, rotation and revolution. Earth spins on a imaginary line that runs north and south. A revolution is the movement around one object around another. The earth follows a path in space. This is called an orbit.
What causes the cycle of seasons on Earth?
What causes seasons is Earths tilt. The axis is tilted 23.5 degrees. If the northern hemisphere is tilted towards the sun then it is summer but in the southern it is winter. Same thing when it is winter in the northern it is summer in the southern.
Section 2: Gravity and Motion.
What determines the strength of the force of gravity between two objects?
The strength of the force of gravity between two objects depends on two factors. The masses of the objects and the distance between them.
What two factors keep the Earth and moon in orbit?
Issac Newton concluded two factors-inertia and gravity-combine to keep Earth in orbit around the sun and the moon in orbit around the sun. The tendency of an object to resist a change in motion is Inertia. Gravity attracts all objects toward each other.
Section 3: Phases, Eclipses, and Tides.
What causes the phases of the moon?
Phases are caused by the positions of the moon, Earth, and the sun. The sun always lights half the moon but depending on which way the moon and the Earth are facing.
What are solar and lunar eclipses?
Eclipses happen when an item in space passes in front the sun and a planet/other object and casts a shadow on it.
What causes the tides?
Tides are caused mainly by differences in how much the Moons gravity pulls on different parts of the Earth.
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