How Fast Can the Earth Orbit the Sun?

In astronomy, the Earth’s orbit is the motion of the Earth around the Sun, from an average distance of approximately 149.59787 million kilometers away. A complete orbit of the earth around the Sun occurs every 365.2563666 mean solar days (1 sidereal year). The orbital speed of the Earth around the Sun averages about 30 km/s…
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How Fast Can the Earth Rotate?

Spinning Globe

The Earth has an equatorial speed of 465.1 m/s, 1,674.4 km/h or 1,040.4 mi/h. Some sources state that Earth’s equatorial speed is slightly less, or 1,669.8 km/h. This is obtained by dividing Earth’s equatorial circumference by 24 hours. However, the use of only one circumference unwittingly implies only one rotation in inertial space, so the…
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How Fast Can Light Travel?

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 299,792,458 metres per second, a figure that is exact because the length of the metre is defined from this constant and the international standard for time. Its value is about 186,282…
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How Fast Can Sound Travel In Water?

In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air. It travels about 4.3 times faster in water (1,484 m/s), and nearly 15 times as fast…
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