Kepler's First Law

Front

What is Kepler's First Law?

Back

Kepler's First Law states that planets move in elliptical orbits with the Sun at one of the foci.

Front

What is the point in a planet's orbit where it is closest to the Sun called?

Back

Perihelion.

Front

What is the point in a planet's orbit where it is farthest from the Sun called?

Back

Aphelion.

Front

What is the width of an ellipse called?

Back

Major axis.

Front

What is the term for the distance between the foci of an ellipse?

Back

Focal length.

Front

What is the shape of a planet's orbit according to Kepler's First Law?

Back

Elliptical.

Front

True or False: As the distance of a planet from the Sun increases, its eccentricity also increases.

Back

False.

Front

What is one of the focal points of Earth's elliptical orbit?

Back

The Sun.

Front

True or False: All planets in our solar system orbit the Sun in the same direction.

Back

True.

Front

What is the term for the distance from the center of an ellipse to a focus?

Back

Focal distance.