SOLAR SYSTEM

Detailed explanation-1: -They describe how (1) planets move in elliptical orbits with the Sun as a focus, (2) a planet covers the same area of space in the same amount of time no matter where it is in its orbit, and (3) a planet’s orbital period is proportional to the size of its orbit (its semi-major axis).

Detailed explanation-2: -Kepler’s laws apply: First Law: Planetary orbits are elliptical with the sun at a focus. Second Law: The radius vector from the sun to a planet sweeps equal areas in equal times. Third Law: The ratio of the square of the period of revolution and the cube of the ellipse semimajor axis is the same for all planets.

Detailed explanation-3: -Answer and Explanation: Yes, Kepler’s laws apply to satellites; whether natural (like the Moon) or artificial (like the International Space Station). Depending on the reason that a satellite is launched, it can sometimes be placed into a highly elliptical orbit or an almost circular orbit.

Detailed explanation-4: -The line joining the Sun and planet sweeps out equal areas in equal times, so the planet moves faster when it is nearer the Sun. Thus, a planet executes elliptical motion with constantly changing angular speed as it moves about its orbit.