How Long to Orbit Milky Way?

How Long to Orbit Milky Way?


230 million years is the time taken by our solar system to rotate around the Milky Way. Dinosaurs just began to roam on the Earth, the last time Earth was in its current position.


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The planets in our solar system orbit around the sun. One orbit of the Earth takes one year. Meanwhile, our entire solar system – our sun with its family of planets, moon, asteroid, and comets – orbits the center of the Milky Way galaxy. Our sun and solar system move at about 500,000 miles an hour (800,000 km/hr) in this huge orbit. So in 90 seconds, for example, we all move some 12,500 miles (20,000 km) in orbit around the galaxy's center.

Our Milky Way galaxy is a big place. Even at this blazing speed, it takes the sun approximately 230 million years to complete one journey around the galaxy's center.

This amount of time – the time it takes us to orbit the center of the galaxy – is sometimes called a cosmic year.


How Many Galaxies Are There?

The cosmos contains approximately 100 - 200 billion galaxies.

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Dark Energy

Humans can only see about 4% of the matter in the Universe.

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Mercury and Venus

The only two planets in our solar system that do not have moons are Mercury and Venus.

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Our Sun's Orbit

The sun orbits around the Milky Way at a speed of about 220 km (140 miles) per second.

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