A galactic year is the time it takes the Sun to orbit the centre of the Milky Way (about 230 million years). Using that time scale, the mass extinction event which killed off the dinosaurs happened just over three months ago.
A galactic year is the time it takes the Sun to orbit the centre of the Milky Way (about 230 million years). Using that time scale, the mass extinction event which killed off the dinosaurs happened just over three months ago.