The Milky Way Galaxy contains up to 400 billion stars. It’s about 587 quadrillion miles in diameter and weighs roughly 1.16 duodecillion tonnes. It’s just one of an estimated hundred billion (or more) galaxies in the observable Universe.

The Sun lies 152 quadrillion miles from the centre of the Milky Way. It completes one galactic orbit every 220 million years. The Sun is a G2V yellow dwarf star, approximately 4.57 billion years old with a mass of 1.99 octillion tonnes packed into an average diameter of 895 thousand miles.

The Earth orbits the Sun at a distance of 93 million miles. It weighs 5.9 sextillion tonnes and has an average diameter of 7918 miles. You are here.