Orbital mechanics, rocket science, black holes, stellar physics, and more.
Ship time vs. Earth time for constant-accel/decel interstellar travel
Lorentz factor γ and special-relativistic time dilation
Velocity addition, momentum, kinetic energy, Doppler shift
T = 2π√(a³/GM) — period from orbit radius and central mass
Minimum speed to escape a body's gravity well
Tsiolkovsky Δv = Isp × g₀ × ln(m₀/mf)
Minimum energy orbit transfer between two circular orbits
How gravity slows time near massive bodies
Travel time at light speed between astronomical distances
Schwarzschild radius, Hawking temperature, evaporation time
Your weight on every planet, moon, and the Sun
Star luminosity, temperature, radius, and habitable zone
Circular orbital velocity at any altitude around any body
Stack mission maneuvers and estimate total Δv requirements
Angular size of objects by physical size and distance
Interactive visualization of planet sizes, distances, and orbital data