One cosmic year is equal to

1. 365 days
2. 24 days
3. 2.25 * 10⁶ days
4. 225 * 10⁶ days

The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy. Estimates of the length of one orbit range from 225 to 250 million terrestrial years.