Free Space & Astronomy Calculators
A growing collection of free, browser-based calculators for students, educators, and space enthusiasts. Every tool is built around a real physics equation — explained in plain language so you understand what the number actually means.
📏 Light-Year Converter
Convert light-years to kilometers, miles, AU, and parsecs. See how long light takes to cross any cosmic distance.
⚖️ Weight on Other Planets
Enter your weight, see what you'd weigh on Mercury, Mars, Jupiter, the Moon, Pluto, and the Sun.
🪐 Orbital Period (Kepler)
Calculate how long any object takes to orbit the Sun using Kepler's Third Law. Built-in presets for every planet.
📡 Signal Delay Calculator
How long does a radio signal from Earth take to reach Voyager 1, Mars, or Jupiter? Try the live light-speed visualizer.
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Experience It in 3D
Cinematic 3D solar system, first-person cockpit view, signal-delay calculator — free in your browser.
🚀 Launch Deep Space VoyagersNo download required · Works in any modern browser · Free to explore