Space
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147 free Space trivia questions with answers — science & nature quiz, new questions added Oct 2026.
50 free space trivia questions with answers. From the Moon landing to the mysteries of dark matter, outer space has captivated humanity for centuries. This quiz spans the solar system, the stars and galaxies beyond it, the history of space exploration, cutting-edge missions and the fundamental physics that hold the universe together. The 147 questions run from easy (which planet is the largest) to genuinely hard, so it works as a classroom starter, a science-night round, or a solo test of how much astronomy actually stuck. Every answer has been checked against a real source and each question shows where it came from, so you can see the evidence under each answer instead of taking our word for it.
30 of 147 questions with answers and explanations. Play the quiz
Q 01The zone around a star where a planet could hold liquid water is nicknamed after which fairy-tale character?
Goldilocks
Goldilocks lends the zone its nickname because conditions there are 'just right', and astronomers use it to pick out exoplanets that might host life.
Q 02How long does sunlight take to travel from the Sun to Earth?
About 8 minutes
About 8 minutes for the trip here, yet that energy first spent many thousands of years working its way out from the Sun's core.
Q 03Which mission carried the first astronauts around the Moon, photographing Earthrise on Christmas Eve 1968?
Apollo 8
Apollo 8 was meant to test the lunar module in Earth orbit, but the module ran late, so NASA sent the crew around the Moon instead.
Q 04Who was the first human to walk on the Moon?
Neil Armstrong
Neil Armstrong said he meant 'one small step for a man', but analysts have disagreed over whether he spoke the 'a' and it was lost in transmission.
Q 05Which NASA space telescope was launched in 1990?
Hubble Space Telescope
Hubble Space Telescope's main mirror had a tiny flaw, so its first images were fuzzy until astronauts fitted corrective optics in 1993.
Q 06What is a black hole?
A region from which nothing can escape
A region from which nothing can escape, not even light: that is a black hole, and anything falling in is stretched thin, which scientists call spaghettification.
Q 07Which planet was the first located through mathematical prediction rather than regular observation of the sky?
Neptune
Neptune turned up in 1846 about a degree from where Le Verrier had calculated it should be, working only from odd tugs on another planet's orbit.
Q 08What is the International Space Station (ISS)?
An orbiting research laboratory
An orbiting research laboratory, the ISS circles Earth about every 90 minutes, so its crew sees about 16 sunrises and sunsets a day.
Q 09What is the closest star to Earth after the Sun?
Proxima Centauri
Proxima Centauri is a red dwarf too faint to see with the naked eye, despite being the nearest star to us after the Sun.
Q 10What galaxy do we live in?
The Milky Way
The Milky Way looks like a hazy band across our sky because we sit inside its flat disc of stars and see it edge-on.
Q 11Which NASA rover landed on Mars in February 2021?
Perseverance
Perseverance landed in Jezero Crater because rivers once filled it with a lake, and the delta they left may preserve traces of ancient microbial life.
Q 12What is the Great Red Spot?
A giant storm
A giant storm, the Great Red Spot was about three Earths wide in the late 1800s, but by 2014 telescopes found it at the smallest size ever measured.
Q 13What does NASA stand for?
National Aeronautics and Space Administration
National Aeronautics and Space Administration was built on NACA, America's aircraft research agency, when it opened in 1958, so it researches planes as well as spacecraft.
Q 21What do astronomers call the explosion of a massive star at the end of its life?
Supernova
A supernova seen in 1054 shone in the daytime sky for nearly a month, and the glowing cloud it left behind is the Crab Nebula.
Q 22Which crewed lunar mission suffered an oxygen tank explosion en route to the Moon?
Apollo 13
Apollo 13's oxygen tank exploded two days after launch, so the crew abandoned the landing and squeezed into the two-person lunar module as a lifeboat to get home.
Q 23Roughly how old is the universe?
About 14 billion years
About 14 billion years, and in its first fraction of a second, space itself expanded faster than the speed of light, a burst called cosmic inflation.
Q 14Mark Twain was born during one visit of which comet and died just after its next return?
Halley's Comet
Halley's Comet was back in 1910, and Twain, who had predicted he would 'go out with it', died the day after it passed closest to the Sun.
Q 15What was the first animal sent into orbit around Earth?
Laika the Dog
Laika the dog, a stray picked up off the street, reached orbit in November 1957, but no way to bring her home had been built, and she died within hours.
Q 16What is the Kuiper Belt?
A region of icy bodies beyond Neptune's orbit
A region of icy bodies beyond Neptune's orbit, the Kuiper Belt turned out to hold other Pluto-like worlds, and finding them led to Pluto being reclassified as a dwarf planet in 2006.
Q 17Who founded SpaceX?
Elon Musk
Elon Musk first tried to buy a rocket to send a small greenhouse to Mars, but the price was too high, so he started his own rocket company instead.
Q 18Which boundary is most widely used to mark where Earth's atmosphere ends and space begins?
The Kármán Line
The Kármán Line sits 100 km up, yet NASA and the US military count space as starting lower, at about 80 km, so the edge of space depends on who you ask.
Q 19Which organisation voted in 2006 to reclassify Pluto as a dwarf planet?
International Astronomical Union
The International Astronomical Union decided a planet must clear its orbit of other objects, which Pluto fails because other bodies cross its path.
Q 20What was the first artificial satellite launched into Earth's orbit?
Sputnik 1
Sputnik 1 carried little more than a beeping radio, yet amateurs worldwide could hear it pass overhead, and the shock pushed the United States into the Space Race.
Q 24What type of star is our Sun?
Yellow dwarf
Yellow dwarf is the Sun's nickname, but its light is actually white; it looks yellow from the ground because Earth's atmosphere scatters some blue light away.
Q 25Which planet rotates on its side with an axial tilt of about 98 degrees?
Uranus
Uranus was probably knocked sideways by a collision with an Earth-sized object long ago, which gives it the most extreme seasons of any planet.
Q 26What is the brightest star in the night sky as seen from Earth?
Sirius
Sirius, the Dog Star, gave summer's 'dog days' their name, because the ancient Greeks linked its early-morning rising with the hottest weather.
Q 27What is the name of the first space shuttle to fly in space?
Columbia
Columbia broke apart on re-entry in 2003 because a chunk of foam from its fuel tank had struck its left wing during launch.
Q 28What is the invisible substance thought to make up about 85% of the universe's mass?
Dark matter
Dark matter neither emits nor absorbs light and is inferred only from its gravity, such as the way galaxies spin faster than their visible mass allows.
Q 29Which Galilean moon's smooth, crack-streaked ice shell is thought to cover a saltwater ocean?
Europa
Europa is thought to hide an ocean under its ice, and NASA launched Europa Clipper in October 2024 to learn whether that ocean could support life.
Q 30What is a light-year a measure of?
Distance
Distance, not time: astronomers prefer the parsec, partly because it comes straight from a star's measured parallax.