Which is the best description of Earth’s orbit?(1 point)
Responses
almost circular
almost circular
circular
circular
parabolic
parabolic
highly elliptical
circular
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.