Celestial Explorer — Interactive Solar System & Stars

Compare the sizes of planets, moons, and stars at accurate proportional scale. Explore orbital paths, travel through the solar system, and discover how celestial bodies measure up against one another.

Objects You Can Explore

The eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Dwarf planets: Pluto, Ceres
Major moons: Earth's Moon, Europa, Titan, Ganymede
Our Sun and other stars: Sirius, Betelgeuse, VY Canis Majoris
The asteroid belt and Kuiper belt

Features

True-to-scale orbital view with animated planetary motion
Side-by-side size comparison of any two celestial bodies
Space travel mode to experience interplanetary distances
Detailed fact panels for each celestial object