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97 free Space trivia questions with answers — science & nature quiz, new questions added Aug 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 97 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 97 questions with answers and explanations. Play the quiz
Q 01What is the largest planet in our solar system?
Jupiter
Jupiter is the largest planet in our solar system, with a mass more than twice that of all other planets combined. Its diameter is about 86,881 miles (139,822 km).
Q 02How long does sunlight take to cross the roughly 93 million miles from the Sun to Earth?
About 8 minutes
About 8 minutes and 20 seconds: light travels at about 186,000 miles per second across the roughly 93 million miles between Sun and Earth.
Q 03Which mission first carried humans to the Moon, orbiting ten times without landing and photographing Earthrise on Christmas Eve 1968?
Apollo 8
Apollo 8's Borman, Lovell and Anders became the first people to see the far side of the Moon and took the famous Earthrise photograph on Christmas Eve 1968.
Q 04Who was the first human to walk on the Moon?
Neil Armstrong
Neil Armstrong stepped onto the lunar surface on July 20, 1969, as Apollo 11 commander, saying 'That's one small step for man, one giant leap for mankind.'
Q 05What is the name of NASA's most famous space telescope, launched in 1990?
Hubble Space Telescope
Hubble launched on 24 April 1990 into low Earth orbit, where it circles at about 540 km altitude. It has delivered some of the most detailed visible-light images of distant galaxies and nebulae ever captured.
Q 06What is a black hole?
A region from which nothing can escape
A black hole is a region of spacetime where gravity is so extremely strong that nothing, not even light or other electromagnetic radiation, can escape once past the event horizon.
Q 07Which planet's position was calculated mathematically before anyone had observed it through a telescope?
Neptune
Neptune: Le Verrier and Adams independently predicted its position from irregularities in Uranus's orbit, and Galle found it on 23 September 1846 within a degree of the predicted spot.
Q 08What is the International Space Station (ISS)?
An orbiting research laboratory
The ISS is a modular space station in low Earth orbit, serving as a microgravity research laboratory. It's a joint project among NASA, Roscosmos, JAXA, ESA, and CSA, and has been continuously occupied since November 2000.
Q 09What is the closest star to Earth after the Sun?
Proxima Centauri
Proxima Centauri is the closest known star to the Sun at approximately 4.24 light-years away. It is a small red dwarf star in the Alpha Centauri star system.
Q 10What galaxy do we live in?
The Milky Way
Earth is located in the Milky Way galaxy, a barred spiral galaxy approximately 100,000 light-years in diameter containing an estimated 100-400 billion stars.
Q 11Which NASA rover landed on Mars in February 2021?
Perseverance
NASA's Perseverance rover landed on Mars on February 18, 2021, in Jezero Crater. It carries the Ingenuity helicopter and is searching for signs of ancient microbial life.
Q 12What is the Great Red Spot?
A giant storm
The Great Red Spot is a giant anticyclonic storm in Jupiter's atmosphere, continuously observed since 1878 and measured at about 16,000 km wide by Juno in 2017, wider than Earth.
Q 13What does NASA stand for?
National Aeronautics and Space Administration
Q 21What phenomenon causes a star to explode at the end of its life?
Supernova
A supernova is the explosive death of a massive star, occurring when the star's core collapses. It can briefly outshine an entire galaxy and radiate more energy than our Sun will in its entire lifetime.
Q 22Which crewed lunar mission suffered an oxygen tank explosion en route to the Moon?
Apollo 13
Apollo 13 experienced an oxygen tank explosion on April 13, 1970, forcing the crew to abandon the lunar landing and use the Lunar Module as a lifeboat for the harrowing return to Earth.
Q 23What is the estimated age of the universe?
13.8 billion years
National Aeronautics and Space Administration is the name; it was established in 1958 under President Eisenhower as the agency responsible for the civilian space programme.
Q 14Which planet is famous for its prominent ring system?
Saturn
While all four gas giants have ring systems, Saturn's rings are by far the most prominent and visible, composed primarily of ice particles, rocky debris, and dust.
Q 15What was the first animal sent into orbit around Earth?
Laika the Dog
Laika, a Soviet space dog, became the first animal to orbit Earth aboard Sputnik 2 on November 3, 1957. Sadly, she did not survive the mission, but her flight proved that living passengers could survive launch and weightlessness.
Q 16What is the Kuiper Belt?
A region of icy bodies beyond Neptune's orbit
The Kuiper Belt is a region of icy bodies beyond Neptune's orbit, roughly 30 to 55 AU from the Sun; it holds Pluto, Haumea and Makemake and supplies many short-period comets.
Q 17Who founded SpaceX?
Elon Musk
SpaceX (Space Exploration Technologies Corp.) was founded by Elon Musk in 2002 with the goal of reducing space transportation costs and enabling the colonization of Mars.
Q 18Where does Earth's atmosphere officially end and space begin?
The Kármán Line
The Kármán Line, at an altitude of 100 kilometers (62 miles) above sea level, is the internationally recognized boundary between Earth's atmosphere and outer space.
Q 19How many planets are in our solar system?
8
There are 8 recognized planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet by the IAU in 2006.
Q 20What was the first artificial satellite launched into Earth's orbit?
Sputnik 1
Sputnik 1, a 58-centimetre polished metal sphere, was launched by the Soviet Union on 4 October 1957 and orbited Earth for three months.
The universe is estimated to be approximately 13.8 billion years old, based on observations of cosmic microwave background radiation and measurements from the Planck satellite and other instruments.
Q 24What type of star is our Sun?
Yellow dwarf
Our Sun is a G-type main-sequence star (G2V), commonly called a yellow dwarf. It is a medium-sized star about 4.6 billion years old, roughly halfway through its main-sequence life.
Q 25Which planet rotates on its side with an axial tilt of about 98 degrees?
Uranus
Uranus has an extreme axial tilt of about 98 degrees, meaning it essentially rotates on its side. This is thought to be the result of a collision with an Earth-sized body long ago.
Q 26What is the brightest star in the night sky as seen from Earth?
Sirius
Sirius, also known as the Dog Star, is the brightest star in the night sky with an apparent visual magnitude of -1.46. It is located in the constellation Canis Major, about 8.6 light-years from Earth.
Q 27What is the name of the first space shuttle to fly in space?
Columbia
Space Shuttle Columbia was the first space-rated orbiter in NASA's Space Shuttle fleet, making its first orbital flight (STS-1) on April 12, 1981. Enterprise was a test vehicle that never flew in space.
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 believed to have a vast saltwater ocean beneath its icy crust, making it one of the most promising places in our solar system to search for extraterrestrial life.
Q 30What is a light-year a measure of?
Distance
A light-year is a unit of distance, not time. It represents the distance that light travels in one year in a vacuum, approximately 5.88 trillion miles (9.46 trillion kilometers).