UNIVERSE
SATELLITESICY BODIES
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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: -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-3: -Kepler’s Laws of Planetary Motion In 1605 he announced The First Law: Planets move in ellipses with the Sun at one focus. The figure below illustrates two orbits with the same semi-major axis, focus and orbital period: one a circle with an eccentricity of 0.0; the other an ellipse with an eccentricity of 0.8.
Detailed explanation-4: -Yes. The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster.
Detailed explanation-5: -Answer: Mercury is the winner at an orbital speed of about 47.87 km/s (107, 082 miles per hour), which is a period of about 87.97 Earth days.