Free interactive tool
Solar system atlas
Compare eight planets and open their individual reference pages.
Open tool ↗Zystronqia / interactive desk
Make room for discovery.
Choose a tool, practise a skill or create a plan. Everything here is free.
Free interactive tool
Orbit simulator
Animate an ideal circular orbit with adjustable distance and star mass.
Open tool ↗Free interactive tool
Cosmic distance converter
Convert astronomical units to kilometres, light-years and light travel time.
Open tool ↗Free interactive tool
Telescope magnification
Calculate magnification and exit pupil from optical dimensions.
Open tool ↗Free interactive tool
Escape velocity
Ideal escape speed from a non-rotating spherical body; ignores atmosphere.
Open tool ↗Free interactive tool
Angular size
Calculate apparent angular diameter from physical diameter and distance in matching units.
Open tool ↗Free interactive tool
Stars, galaxies & missions
Explore selected stellar, galactic and space-mission profiles.
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