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Velocity is a indication of speed and direction, so the fact they travel around it means that the direction is continually changing and, therefore velocity is continually changing. Kepler was the astronomer who discovered the laws of motion for the planets. Newton, a century later, derived the laws from his laws of gravity and motion. The first law of planetary motion states that planets orbit the sun in an elipse. So the speed is continually changing.

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Related Questions

What is is called when you travel around the sun or planet?

When you travel around the Sun or a planet, due to gravitational attraction, it is called an "orbit". It is also a "revolution" around the Sun or planet.


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An orbit is the path a planet takes around the sun. Earth's orbit is an ellipse. It takes the Earth one year to travel along the elliptical path around the sun.


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When a planet is closer to the Sun is the orbit around the Sun shorter or longer?

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The earth is moving fastest in its orbit at the moment of perihelion, when it is closest to the sun. the happens around January 3.


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Around its axis is a day. Around its orbit is a year.


What do you call a path a planet follows as it travels around the sun?

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