UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Planets closest to the Sun will orbit with the fastest orbital speed.
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Planets with the greatest mass will orbit the Sun with the fastest orbital speed.
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Planets furthest from the Sun will orbit with the fastest orbital speed.
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Planets with the least mass will orbit the Sun with the fastest orbital speed.
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Detailed explanation-1: -Kepler’s Second Law Describes the Way an Object’s Speed Varies along Its Orbit. 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.
Detailed explanation-2: -The closer a planet is to the Sun, the faster it travels around the Sun.
Detailed explanation-3: -The point of nearest approach of the planet to the Sun is termed perihelion. The point of greatest separation is aphelion, hence by Kepler’s Second Law, a planet is moving fastest when it is at perihelion and slowest at aphelion.
Detailed explanation-4: -Through Brahe’s astronomical measurements and Kepler’s own drawings of the geometrical relationship between the Sun and Mars in various parts of the planet’s orbit, Kepler discovered that planets moved faster when they were closer to the Sun.
Detailed explanation-5: -The closer a planet is to the Sun, the less time it takes for it to go around the Sun. It takes less time because the length of the orbit is shorter (a smaller orbit), but it also moves faster in its orbit. Thanks to gravity, it has to move faster in its orbit to stay in orbit!