Which is the best description of Earth’s orbit?(1 point)

Question

Responses

almost circular
almost circular

circular
circular

parabolic
parabolic

highly elliptical

Answer 1

circular

Answer 2

Which statement describes Kepler’s third law of orbital motion?(1 point)
Responses

The cube of orbital period is proportional to the square of the semi-major axis.
The cube of orbital period is proportional to the square of the semi-major axis.

The square of orbital period is proportional to the cube of the semi-major axis.
The square of orbital period is proportional to the cube of the semi-major axis.

The square of orbital period is proportional to the semi-major axis.
The square of orbital period is proportional to the semi-major axis.

The orbital period is proportional to the square of the semi-major axis.

Answer 3

The cube of orbital period is proportional to the square of the semi-major axis.