Which is the best description of Earth’s orbit?(1 point)
almost circular
almost circular
circular
circular
highly elliptical
highly elliptical
parabolic
almost circular
Which statement describes Kepler’s third law of orbital motion?(1 point)
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 orbital period is proportional to the square of the semi-major axis.
The 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.