galactic year
Sign in to saveAlso known as cosmic year
amount of time it takes the universe to rotate, unit of time equivalent to 230 million years
Wikidata facts
Show 3 more facts
- conversion to standard unit
- 237500000
- conversion to SI unit
- 7494930000000000
- unit symbol
- gal
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Article
Approximate orbit of the Sun (yellow circle) around the Galactic Center
The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. One galactic year is approximately 225 million Earth years. The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph) within its trajectory around the Galactic Center, a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds; that speed corresponds to approximately 1/1300 of the speed of light.
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