World 3 · Satellite & Rocket Engineering · 8 min · PROThe delta-v budget
Currency of spaceflight
PRO · Orbits & Gravity
World 3: Satellite & Rocket Engineering is part of PRO
The first world of Orbits & Gravity is free. PRO opens the other 34 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 26 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly