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TEST YOUR COSMIC KNOWLEDGE

From rocket engines to quantum communication satellites — challenge yourself with 200+ expert-crafted questions across 10 categories of space technology.

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200+ Questions
10 Categories
5 Difficulty Levels
The ISS orbits Earth 16 times per day at ~28,000 km/h SpaceX's Raptor engine burns liquid methane and oxygen The James Webb Space Telescope can see 13.6 billion light-years away Voyager 1 has been traveling since 1977 and is now in interstellar space Mars rovers communicate via NASA's Deep Space Network A cubesat standard unit is exactly 10×10×10 cm Ion thrusters can operate for years in space with high efficiency The first commercial crew mission to ISS flew in 2020 aboard SpaceX Crew Dragon The ISS orbits Earth 16 times per day at ~28,000 km/h SpaceX's Raptor engine burns liquid methane and oxygen The James Webb Space Telescope can see 13.6 billion light-years away Voyager 1 has been traveling since 1977 and is now in interstellar space Mars rovers communicate via NASA's Deep Space Network A cubesat standard unit is exactly 10×10×10 cm Ion thrusters can operate for years in space with high efficiency The first commercial crew mission to ISS flew in 2020 aboard SpaceX Crew Dragon
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🔥 Featured This Week

Reusable Launch Vehicles: The New Space Race

Explore the engineering breakthroughs behind Falcon 9, New Shepard, Starship, and Vulcan Centaur. How well do you know the propulsion systems, landing technologies, and economics of reusability?

⏱ ~12 minutes 📋 15 questions 🏆 Hard difficulty 👥 4,231 attempts
🚀
// explore categories

Choose Your Mission

From orbital mechanics to quantum communication — pick your area and test your expertise.

🔥 Medium

Rocket Propulsion

Liquid, solid, hybrid, and ion engines. Explore Isp, thrust-to-weight ratios, and cutting-edge propulsion research from methane engines to nuclear thermal rockets.

📋 20 questions ⏱ ~15 min 👥 12.4k
🛰️ Beginner

Satellites & Orbits

LEO, MEO, GEO, HEO — understand orbital mechanics, satellite constellations, Starlink, OneWeb, and the science of staying in orbit.

📋 18 questions ⏱ ~12 min 👥 18.7k
🔴 Hard

Mars Exploration

Rovers, landers, and the dream of crewed missions. Dive into Perseverance, InSight, MOXIE, and the technical challenges of the 140-million-mile journey.

📋 22 questions ⏱ ~18 min 👥 9.1k
👨‍🚀 Medium

Spacewalks & EVA Tech

Extravehicular Activity suits, SAFER jetpacks, tether systems, and the physics of working in the vacuum of space. Essential astronaut knowledge.

📋 16 questions ⏱ ~11 min 👥 7.3k
🔭 Beginner

Space Telescopes

From Hubble to JWST to the upcoming Nancy Roman. Infrared vs visible light, L2 orbit, primary mirror engineering, and the discoveries that changed astronomy.

📋 15 questions ⏱ ~10 min 👥 22.5k
🚀 Hard

Reusable Launch Vehicles

The engineering of landing booster rockets, grid fins, RCS thrusters, and the economics that are reshaping the entire launch industry.

📋 15 questions ⏱ ~12 min 👥 4.2k
📦 Medium

CubeSats & Small Sats

The democratization of space. Form factors, off-the-shelf components, launch opportunities, and how a shoebox-sized satellite can change industries.

📋 14 questions ⏱ ~10 min 👥 5.8k
💨 Expert

Life Support Systems

ECLSS aboard the ISS, closed-loop oxygen generation, water recycling, CO₂ scrubbing, and the engineering required to keep humans alive beyond Earth.

📋 20 questions ⏱ ~16 min 👥 3.4k
⚛️ Expert

Quantum Space Comms

Quantum key distribution, entanglement-based communication, China's Micius satellite, and the future of unhackable space communication networks.

📋 12 questions ⏱ ~10 min 👥 2.1k
🌌 Hard

Deep Space Missions

Voyager, New Horizons, Cassini, Parker Solar Probe, and the grand tour. Gravity assists, long-range communication, and the edge of our solar system.

📋 18 questions ⏱ ~14 min 👥 6.9k
// space tech history

Milestones That
Shaped Space Tech

Key moments in the history of space technology — each a stepping stone to where we are today.

1957
Sputnik 1 — The First Satellite
The Soviet Union launches the world's first artificial satellite, a 58 cm aluminum sphere transmitting radio signals. The Space Age officially begins.
1969
Apollo 11 — Humans on the Moon
The Saturn V rocket — still the most powerful ever flown — delivers astronauts Armstrong and Aldrin to the lunar surface. A triumph of systems engineering.
1981
Space Shuttle — Reusability Begins
The first partially reusable launch system flies. Columbia's 54.5-ton orbiter returns to Earth on a runway, pioneering concepts that SpaceX would later revolutionize.
1998
ISS — International Cooperation
Construction begins on the International Space Station. The largest human structure in orbit becomes a permanent laboratory for microgravity research.
2008
Falcon 1 — Commercial Era Opens
SpaceX becomes the first private company to reach orbit with a liquid-fueled rocket. The commercial space industry fundamentally shifts.
2015
Falcon 9 — Booster Landing
SpaceX lands an orbital-class rocket booster for the first time in history. The economics of launch change overnight. Reusability becomes reality.
2021
JWST — A New Eye on the Universe
The James Webb Space Telescope launches after decades of development, unfolding a gold-coated beryllium mirror 6.5 meters across at L2 to see the universe's first light.
2024+
Starship & Artemis — Return to the Moon
Full-stack Starship testing proceeds alongside NASA's Artemis program, targeting a human return to the lunar surface with next-generation systems.
// fascinating facts

Did You Know?

Surprising facts from the frontiers of space technology.

01
Starship's Raptor engines burn subcooled liquid methane and oxygen
The propellants are chilled below their boiling point to increase density, allowing more fuel per tank volume — a key SpaceX innovation.
02
The ISS water recycling system recovers ~93% of all water onboard
ECLSS processes urine, sweat, and exhaled moisture back into drinkable water. Astronauts joke that yesterday's coffee becomes tomorrow's coffee.
03
JWST's sunshield is the size of a tennis court
The 5-layer sunshield made of Kapton keeps the telescope at –233°C, colder than Pluto's surface, to detect infrared signals from the early universe.
04
A single Falcon 9 first stage has been reflown up to 19 times
Each recovered booster undergoes inspection, refurbishment, and testing before reuse — dramatically reducing cost per kilogram to orbit.
05
Ion thrusters can run continuously for years
Dawn spacecraft's ion engines operated for over 50,000 hours. They use electricity to accelerate xenon ions at speeds up to 90,000 mph.
06
SpaceX's Starlink constellation has over 6,000 satellites in orbit
Each satellite uses krypton-fueled Hall-effect thrusters and autonomous collision avoidance to maintain its position in LEO without ground control commands.
07
Mars takes 687 Earth days to orbit the Sun
This means launch windows to Mars open only every ~26 months. Missing a window means waiting over two years for the planets to align again.
08
CubeSats can be as small as 10×10×10 cm and still reach orbit
The 1U cubesat standard, developed in 1999, democratized space access. Universities, startups, and even high schools now operate satellites.
09
Radio signals from Voyager 1 take over 22 hours to reach Earth
Launched in 1977, Voyager 1 is now over 24 billion kilometers away. Its 23-watt transmitter (the power of a fridge light) still reaches NASA.
// top players this month

Global
Leaderboard

# Explorer Score Progress Quizzes
1 CosmicNerd_88 98.4%
142
2 StarshipPilot 96.1%
97
3 OrbitMechanic 94.7%
118
4 NebulaDrifter 92.3%
83
5 QuantumThruster 91.0%
76
6 AstroEngineer 89.5%
65
7 VenusTransit 87.2%
54
8 LaunchControl 85.9%
49
// your achievements

Mission
Badges

🌍
Ground Control
Complete your first quiz
🏆
Perfect Orbit
Score 100% on any quiz
🔥
Reentry Burn
Complete 10 quizzes
⚛️
Quantum Mind
Master the Expert tier
🌌
Deep Space
Complete all categories
👾
Space Legend
Top 10 globally
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