Chapter 8 Lesson 1 - Earth and Sun
rotation
A complete spin on the axis
gravity
A force of attraction, or pull, between any two objects.
orbit
A path one object takes around another object.
What causes the seasons on Earth?
As Earth revolves around the Sun, sunlight hits different parts of the Earth at different angles.
revolution
One complete trip around the Sun
Moon's gravity vs. Earth's
The Moon's gravity is 17% of Earth's gravity
mass
The amount of matter in an object.
perihelion
The closest that Earth gets to the Sun
aphelion
The farthest Earth can get from the Sun
axis
The imaginary line on which the earth rotates.
What causes day and night on Earth?
The rotation of the Earth on its axis
inertia
The tendency of a moving object to keep moving in a straight line.
What keeps the planets orbiting the sun?
gravity and inertia
factors that influence gravity
mass and distance
ellipse
the nearly circular orbit of the Earth is called an ____________.