The layer of gases that surrounds a planet.

The point in an orbit where an object is farthest from the Sun.

A unit used to measure distances in space; it is about the distance from Earth to the Sun.

A measurement of how stretched out or oval an orbit is

An oval-shaped path that planets and other objects can follow as they orbit.

One or two fixed points inside an ellipse that help determine its shape.

The force that pulls objects toward each other because they have mass.

Gravitational Constant

A number that represents the strength of gravity in calculations.

The curved path an object follows as it moves around another object in space

The point in an orbit where an object is closest to the Sun.

Revolution (Planetary)

The movement of a planet as it travels around the Sun.

The spinning of a planet around its own axis.

An object that moves around a planet or another larger object in space.

Half of the longest distance across an ellipse, measured through its center.

Half of the shortest distance across an ellipse, measured through its center.

An imaginary line that an object rotates around.

The path that a moving object follows through space.

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vocab2

Term	Definition
Atmosphere	The layer of gases that surrounds a planet.
Aphelion	The point in an orbit where an object is farthest from the Sun.
Astronomical Unit	A unit used to measure distances in space; it is about the distance from Earth to the Sun.
Eccentricity	A measurement of how stretched out or oval an orbit is
Ellipse	An oval-shaped path that planets and other objects can follow as they orbit.
Focus/Foci	One or two fixed points inside an ellipse that help determine its shape.
Gravitation	The force that pulls objects toward each other because they have mass.
Gravitational Constant	A number that represents the strength of gravity in calculations.
Orbit	The curved path an object follows as it moves around another object in space
Perihelion	The point in an orbit where an object is closest to the Sun.
Revolution (Planetary)	The movement of a planet as it travels around the Sun.
Rotation (Planetary)	The spinning of a planet around its own axis.
Satellite	An object that moves around a planet or another larger object in space.
Semi-major Axis	Half of the longest distance across an ellipse, measured through its center.
Semi-minor Axis	Half of the shortest distance across an ellipse, measured through its center.
Axis	An imaginary line that an object rotates around.
Trajectory	The path that a moving object follows through space.

Created by: taytay2135

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