PLANET & STAR SIZE COMPARISON
Put cosmic giants side-by-side to grasp the humbling scale of the Universe, from tiny asteroids to gargantuan hypergiant stars and black holes.
Interactive True-to-Scale View
Body A
True Proportional Scale
Body B
1.0×
Diameter Ratio
1.0×
Surface Area Ratio
1.0×
Volume Capacity
Cosmic Capacity Insight
Why the Scale of the Universe Melts Human Minds
Because volume scales with the cube of the radius ($V = \frac{4}{3}\pi r^3$), a small increase in diameter yields an unimaginable increase in volume. For instance, the Sun is only 109 times the diameter of Earth, yet you could fit over 1,300,000 Earths inside it!
When you advance to red supergiants like Stephenson 2-18 (~2,150 solar radii), the star could contain roughly 10 billion Suns or 13 quadrillion Earths!