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The galactic year, also known as a cosmic year, is the duration of time required for the solar system to orbit once around the centre of the Milky Way galaxy. Estimates of the length of one orbit range from 225 to 250 million "terrestrial" years.

This means "we" have been around the centre of our Galaxy, only 20 times.

Estimates place the speed of rotation at approximately 230 kilometers a second, or 828,000kph (515,000 mph)

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13y ago
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13y ago

Astronomers approximate our solar system as well as our sun to be around 4.6 billion years old. In fact many scientists believe that everything in the entire solar system was created at the same time.

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9y ago

Carl Sagan wrote books that included his idea of a cosmic year. By his theory, an earth year would consist of 438 years a second in a cosmic year.

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13y ago

The Sun is about 4.57 billion years old, and roughly halfway through its life-cycle.

See related link for a pictorial

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15y ago

The sun is a bit over eight light minutes from the earth. If it were one full light day away, it would be 1/365th of a light year. At 8.3 light minutes, it is only 1/63367th of a light year.

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14y ago

it's 4.5 billion years old if that's what you mean

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12y ago

What is "solar sun" supposed to mean??? If you mean the Sun, it is about as old as the entire Solar System - estimated at 4.6 billion years.

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12y ago

If you mean the time our Sun takes to go once around the Milky Way, that is estimated to be about 250 million years.

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Q: How many earth years in a cosmic year?
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