Real orbital mechanics. Pull back, aim, burn — and pray your gravity assist actually works.
The orbital puzzle game for people who want to fly across the solar system but only have five minutes.
Keplerian orbits, eccentric trajectories, SOI transitions. Not a cartoon — a simulation. Every burn costs delta-v, every gram of fuel matters.
Each crux is a self-contained orbital puzzle. Waiting for coffee? Nail a Hohmann transfer. On the bus? Try a two-burn gravity assist. No save files, no 40-hour campaigns.
Pull back to set your burn vector. Release to fire. Feels like Angry Birds, works like mission control. Your intuition is the flight computer.
Each mission is a single orbital problem. Pick one.
Learn the basics by circularizing your orbit around Earth. You start in an elliptical orbit and must perform a maneuver to achieve a stable circular orbit.
Change your orbit altitude from 400 km to 800 km using a Hohmann transfer. Learn how to efficiently raise your orbit.
Discover the relationship between orbital energy, speed, and altitude. Learn why you move faster when you're closer to the planet.
Learn to make perfect circular orbits by matching your periapsis and apoapsis. This essential skill is needed for stable orbits and rendezvous.
Execute an OSIRIS-REx style mission to a near-Earth asteroid. Rendezvous with asteroid Bennu, match its velocity precisely, perform a touch-and-go sample collection, then return your precious cargo to Earth. Every gram of primordial material is priceless for science.
Master the concept of eccentricity - the number that describes your orbit's shape. Learn to recognize different orbit types by their eccentricity.
"It's more than clever. Isaac Newton didn't do a lot more when he deduced elliptical orbits from the inverse square law."
— Vernor Vinge, The Peace War (1984)