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.
Learn how to change your orbital inclination. You're in an equatorial orbit and need to reach a polar orbit. This maneuver is crucial for satellite positioning and interplanetary transfers.
Change your orbit altitude from 400 km to 800 km using a Hohmann transfer. Learn how to efficiently raise your orbit.
Perform a soft landing on the Moon. Start from lunar orbit and touch down gently on the surface. Master the balance between descent speed and fuel consumption.
Master the art of orbital rendezvous. You need to match orbits with a target spacecraft and approach within close range. This is essential for docking operations and space station visits.
Learn how orbital period relates to altitude. Understand Kepler's Third Law and how to calculate when you'll arrive somewhere.
Learn to make perfect circular orbits by matching your periapsis and apoapsis. This essential skill is needed for stable orbits and rendezvous.
Learn how different burns at different positions affect your orbit. Understand the fundamental principle: you change the opposite side of your orbit.
Understand the six cardinal directions in space: prograde, retrograde, normal, anti-normal, radial, and anti-radial. Learn how velocity changes affect your orbit.
Learn what an orbit actually is and why objects stay in orbit instead of falling down. Discover the fundamental relationship between velocity and gravity.
Travel from Earth to the Moon and achieve a stable lunar orbit. Your first journey to another celestial body!
Discover the relationship between orbital energy, speed, and altitude. Learn why you move faster when you're closer to the planet.
The ultimate challenge: perform a complete mission from Earth to Saturn orbit with an absurdly limited fuel budget. Use every trick in the book - gravity assists, aerobraking, low-energy transfers, and perfect timing.
Deep dive into the two most important points in your orbit. Learn to use them strategically for efficient maneuvering.
Launch from Earth and dock with the International Space Station in its 51.6-degree inclined orbit. Time your launch window correctly and perform a precise rendezvous.
Learn to plan missions by calculating total delta-V requirements. Master the art of fuel budgeting for complex multi-stage missions.
Your spacecraft has suffered a malfunction and you need to return to Earth immediately. Perform an emergency de-orbit and atmospheric entry with limited fuel and tight time constraints.
Establish a Sun-synchronous orbit for an Earth observation satellite. This special orbit keeps your satellite in constant sunlight, perfect for solar-powered imaging missions.
Establish a Molniya orbit, a highly elliptical orbit used for communications in high-latitude regions. This orbit provides long dwell time over the northern hemisphere.
Master the concept of eccentricity - the number that describes your orbit's shape. Learn to recognize different orbit types by their eccentricity.
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.
Execute a Hohmann transfer from Earth orbit to Mars orbit. Achieve Mars orbit insertion with minimal delta-V expenditure.
Journey from the red planet to the largest object in the asteroid belt. Ceres is a dwarf planet with potential subsurface oceans, making it a prime target for exploration. Execute a direct transfer and achieve orbit insertion around this mysterious world.
Execute a Hohmann transfer from Earth to Venus. Unlike Mars, Venus is closer to the Sun, requiring a different approach. Achieve Venus orbit insertion on a limited fuel budget.
Journey to Uranus, the tilted ice giant with its unique sideways rotation, and tour its five major moons: Miranda with its extreme terrain, Ariel and Umbriel with their contrasting surfaces, and the larger Titania and Oberon. This 7-9 year mission explores one of the least understood regions of the solar system.
Recreate NASA's Dawn mission approach to Vesta, the second-largest asteroid. Use ion propulsion to spiral into three different science orbits, from high survey orbit down to low-altitude mapping. Master the art of continuous low-thrust maneuvering.
Journey to Jupiter's Trojan asteroids, trapped in stable orbits at the L4 and L5 Lagrange points. These ancient remnants from the early solar system orbit 60° ahead and behind Jupiter. Visit multiple Trojans in both swarms, inspired by NASA's Lucy mission.
Tour Saturn's magnificent moon system in the tradition of the Cassini mission. Use resonant orbits and gravity assists to visit Titan, Enceladus, Rhea, and Dione efficiently. Each moon reveals new wonders - from Titan's thick atmosphere to Enceladus' icy geysers.
Deploy a space telescope at the Sun-Earth L2 Lagrange point, following in the footsteps of James Webb Space Telescope. This gravitationally stable location 1.5 million km from Earth provides an ideal vantage point for observing the universe, with continuous power from the Sun and communication with Earth.
Position a solar monitoring satellite at Sun-Earth L1 to provide early warning of space weather. This critical location, 1.5 million km sunward of Earth, offers continuous view of the Sun and 30-60 minutes advance warning of solar storms. Establish and maintain a Lissajous orbit for uninterrupted observations.
Intercept a sungrazing comet on its death-defying plunge toward the Sun. These comets pass within a few solar radii of our star's surface, experiencing temperatures over 2000°C. Your spacecraft must survive the intense heat and radiation while collecting priceless data on this cosmic suicide dive.
Use Venus' gravity to boost your velocity toward the outer solar system. Master the art of gravity assists by performing a precise flyby of Venus.
Execute a Hohmann transfer from Earth to Jupiter, the king of planets. This long-duration mission requires careful planning and fuel management for orbit insertion around this gas giant.
Travel to Saturn and achieve orbit around this magnificent ringed planet. This is one of the most distant targets in the solar system, requiring exceptional mission planning.
Perform a bi-elliptic transfer to raise your orbit. Sometimes going the long way around uses less fuel than a direct Hohmann transfer. Master this advanced orbital maneuver technique.
Visit multiple moons of Jupiter in a single mission. Use gravity assists from Io, Europa, and Ganymede to efficiently tour the Galilean satellites.
A comet is passing through the inner solar system, and you have a narrow window to intercept it for scientific study. Speed is essential, but so is fuel efficiency.
Use both Venus and Earth in a gravity assist sequence to reach Jupiter with minimal fuel. This is the classic VEEGA (Venus-Earth-Earth Gravity Assist) maneuver.
You need to rendezvous with a target spacecraft, but you're in the wrong position in your orbit. Use phasing orbits to adjust your position and arrive at exactly the right time.
Master one of the most expensive maneuvers in spaceflight - changing your orbital plane. Learn techniques to minimize the massive fuel costs.
Learn to synchronize your position with a target spacecraft. Master the technique of using a different orbital period to catch up or slow down relative to another object.
Intercept a potentially hazardous asteroid and use a kinetic impactor to slightly alter its trajectory. Small changes now prevent Earth impact decades later. The fate of humanity depends on precision.
Achieve the highest possible spacecraft velocity using a Jupiter gravity assist followed by a close solar perihelion burn (solar Oberth maneuver). Dive to within 4 solar radii, perform a powerful burn at maximum velocity, and escape the solar system at over 60 km/s - fast enough to reach 100 AU in 25 years.
Attempt one of the most difficult rendezvous missions possible: matching velocity with Halley's Comet in its retrograde orbit. With a 162° inclination, this requires nearly reversing your orbital direction - an astronomical 16+ km/s plane change. Only attempted once (by Giotto in 1986 flyby), never achieved.
Explore the scattered disk, the most distant populated region of the solar system. Perform a Grand Tour of multiple trans-Neptunian objects beyond 40 AU, including at least one encounter beyond 50 AU. This multi-year expedition maps the outer frontier of our planetary system.
Enter a halo orbit around the Earth-Moon L2 Lagrange point. This three-dimensional orbit is challenging to establish but provides continuous line-of-sight to the lunar far side.
Undertake an epic 8-10 year journey to visit all four of the largest asteroids: Ceres, Vesta, Pallas, and Hygiea. This Grand Tour of the asteroid belt requires masterful trajectory planning, as Pallas' 34° inclination makes it particularly challenging to reach. Use asteroid gravity assists where possible to conserve fuel.
Follow in the footsteps of the Voyager missions by visiting Jupiter, Saturn, Uranus, and Neptune using gravity assists. This is the ultimate test of mission planning and execution.
Venture into the Kuiper Belt to encounter Makemake, one of the five dwarf planets and a pristine remnant from the solar system's formation. At 45 AU from the Sun, this 12-15 year odyssey pushes the boundaries of human exploration. Multiple gravity assists are essential for this extreme mission.
Tour all four Galilean moons while surviving Jupiter's brutal radiation belts. Visit volcanic Io, icy Europa with its subsurface ocean, massive Ganymede with its magnetic field, and ancient Callisto. Balance science objectives against cumulative radiation dose in this challenging multi-moon mission.
Break the speed record to the edge of the solar system. Voyager 1 took 35 years to reach 100 AU - you must do it in under 10 years. This requires an aggressive multi-planet gravity assist sequence culminating in a close solar flyby. Push spacecraft velocity to the absolute limit.
Use Titan's thick nitrogen atmosphere to gradually lower your orbit through repeated aerobraking passes. Each atmospheric pass removes orbital energy without using fuel, but fly too deep and you'll burn up. Achieve a stable science orbit around Saturn's largest moon using this advanced technique.
Use a low-energy transfer along the weak stability boundary to reach the Moon with minimal fuel. This advanced technique exploits three-body dynamics for extreme fuel efficiency.
Journey to Sedna, one of the most distant and mysterious objects in the solar system. With an orbit stretching from 76 to 937 AU over 11,400 years, Sedna barely remains bound to the Sun. Catch it near perihelion (current opportunity!) before it retreats to the edge of the solar system for millennia.
Design a mission to reach Alpha Centauri in 500 years - an engineering thought experiment that demonstrates why interstellar travel is so challenging. Combine maximum gravity assists, solar Oberth burns, nuclear propulsion, and solar sails to achieve 0.01c (3,000 km/s). This 'impossible' mission showcases the vast gulf between interplanetary and interstellar scales.
In October 2017, humanity discovered our first interstellar object: 'Oumuamua. With only weeks to respond and a hyperbolic trajectory exceeding 26 km/s, this represents the ultimate fast-response challenge. Achieving intercept requires technology and velocities beyond current capabilities - but what an achievement it would be!