UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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At a constant speed in circular orbits
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In elliptical orbits and faster at the perihelion
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In elliptical orbits and slower at the perihelion
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At a constant speed in elliptical orbits
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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: -A planet’s orbital speed changes, depending on how far it is from the Sun. The closer a planet is to the Sun, the stronger the Sun’s gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun’s gravitational pull, and the slower it moves in its orbit.
Detailed explanation-3: -Kepler’s Second Law characterizes the the velocity of a planet along its elliptical path. Kepler’s Second Law says says that a line running from the sun to the planet sweeps out equal areas of the ellipse in equal times. This means that the planet speeds up as it approaches the sun and slows down as it departs from it.
Detailed explanation-4: -The fastest a planet moves is at perihelion (closest) and the slowest is at aphelion (farthest).