Which planet’s orbit was Kepler first studying when he began to develop his laws of orbital motion?(1 point)

Jupiter

Which orbital shape did most scientists in the early 1600s think the planets of our solar system have?(1 point)

Most scientists in the early 1600s thought that the planets of our solar system have circular orbits.

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

Responses

T∝a2T∝a2

T3 ∝a2T3 ∝a2

T2 ∝ a3 T2 ∝ a3

T2∝a

The correct answer is: T2 ∝ a3

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

Responses

The best description of Earth's orbit is roughly elliptical, with the Sun at one of the foci.

parabolic

parabolic

circular
circular

almost circular
almost circular

highly elliptical

The correct answer is: almost circular

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

Responses

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