🪐 Explore Other Planets
Jupiter
The solar system's biggest planet, with storms larger than Earth itself. A failed star with 90+ moons and a Great Red Spot that's been raging for centuries.
Saturn
Famous for the rings, hiding a lot more. Light enough to float in water, with dozens of moons and the most distinctive look in the solar system.
Uranus
The ice giant that rotates on its side. Why it spins the wrong way, what gives it that strange blue-green color, and what makes it different from Neptune.
Neptune
The farthest planet, blue and brutally windy. Winds faster than any other planet, a moon orbiting backwards, and only one spacecraft has ever visited.
🌌 Beyond the Planets
The Moon
Earth's closest neighbor and oldest companion. Where it came from, why it has phases, and answers to all the questions about humans and the Moon.
The Sun & Stars
How stars burn, live, and die. Our nearest star, plus the bigger picture of stellar life cycles across the universe.
Black Holes
Where physics gets weird and gravity wins. What black holes actually are, what would happen if you fell in, and why they matter for the rest of the universe.
Space Basics
The foundational questions about space, answered. From why space is dark to whether sound travels in a vacuum, the answers nobody taught you in school.
🛠️ Free Tools & Calculators
Weight on Other Planets Calculator
See how much you'd weigh on every planet, the Moon, Pluto, and the Sun's crushing gravity. No signup, just answers.
Your Age on Other Planets Calculator
How old you'd be on Mercury, Mars, Jupiter, and beyond. Some surprising results waiting on Neptune.
Black Hole Weight Calculator
See what gravity does to your weight near a black hole, including the tidal forces that would stretch you into spaghetti.