12 Mind-Blowing Space Facts You'll Learn From Our Science Quizzes

Space is weird. Not "a little quirky" weird, but "fundamentally challenges everything you thought you understood about reality" weird. After building dozens of science quizzes here at Quizzy, we have collected some of the most astonishing facts about the universe -- the kind of facts that make you stop scrolling and say, "Wait, seriously?"

Here are 12 space facts pulled from our Solar System Quiz, Mars Quiz, Space Exploration Quiz, and Astronomy Deep Dive Quiz that will permanently change how you look at the night sky.

Facts About Our Solar System

1. A Day on Venus Is Longer Than a Year on Venus

Venus takes 243 Earth days to complete one rotation on its axis but only 225 Earth days to orbit the Sun. This means a single Venusian day is actually longer than a Venusian year. Oh, and Venus rotates backward compared to most planets, so the Sun rises in the west and sets in the east. Nobody said the universe had to make sense.

2. Saturn Would Float in a Bathtub

Saturn's density is about 0.687 grams per cubic centimeter, which is less than water. If you could somehow find a bathtub large enough (Saturn is 764 times the volume of Earth), the ringed planet would float. It is the only planet in our solar system with this property, and it regularly stumps quiz takers who assume gas giants must be incredibly dense.

3. Mars Has the Tallest Mountain in the Solar System

Olympus Mons on Mars stands approximately 22 kilometers (13.6 miles) high -- nearly three times the height of Mount Everest. Its base is so wide that if you stood on the edge, you would not be able to see the summit because it would be below the curve of the horizon. Our Mars Quiz dives deep into these Martian superlatives.

4. Jupiter's Great Red Spot Could Swallow Earth

The Great Red Spot is a storm that has been raging for at least 350 years. At its widest, it measures about 16,000 kilometers across -- wide enough to fit 1.3 Earths inside it. The storm has been shrinking over the past century, but it remains one of the most dramatic features in our solar system.

Facts About the Wider Universe

5. There Are More Stars Than Grains of Sand on Earth

Scientists estimate there are roughly 70 sextillion (70,000,000,000,000,000,000,000) stars in the observable universe. That is more than the total number of grains of sand on every beach and desert on Earth. Every single one of those stars could have its own planetary system. The scale is genuinely incomprehensible.

6. A Teaspoon of Neutron Star Weighs 6 Billion Tons

Neutron stars are the collapsed cores of massive stars, and their density is almost beyond imagination. A sugar-cube-sized amount of neutron star material would weigh about 6 billion tons on Earth -- roughly the same as every car in the United States combined. This is one of the facts in our science quizzes that gets the most "no way" reactions.

7. Space Is Completely Silent

Sound waves need a medium to travel through -- air, water, or solid material. In the vacuum of space, there is no medium, so there is no sound. The dramatic explosions and engine roars you hear in sci-fi movies? Completely fictional. An explosion in space would be eerily, absolutely silent.

8. The Observable Universe Is 93 Billion Light-Years Across

Even though the universe is only about 13.8 billion years old, the observable universe stretches 93 billion light-years in diameter. This seems contradictory until you realize that space itself has been expanding since the Big Bang. Light from the earliest objects has been traveling toward us while the space between us has been stretching, pushing those objects much farther away than their age alone would suggest.

Facts About Space Exploration

9. Footprints on the Moon Will Last Millions of Years

The Moon has no atmosphere, which means no wind or weather to erode anything. The footprints left by Apollo astronauts will remain undisturbed for an estimated 10 to 100 million years. The only things that could erase them are micrometeorite impacts, which happen extremely slowly. Test your knowledge of the Apollo missions in our Space Exploration Quiz.

10. The International Space Station Travels at 28,000 km/h

The ISS orbits Earth at roughly 28,000 kilometers per hour (17,500 mph), completing one full orbit every 90 minutes. This means astronauts aboard the station witness 16 sunrises and 16 sunsets every single day. It is also the most expensive object ever built by humanity, with a total cost exceeding $150 billion.

11. We Have Sent a Car Into Orbit Around the Sun

In 2018, SpaceX launched a Tesla Roadster into space as a test payload for its Falcon Heavy rocket. The car, with a mannequin named "Starman" in the driver's seat, is currently orbiting the Sun and will continue to do so for millions of years. It has already completed several orbits and occasionally passes near Mars.

12. Voyager 1 Is the Farthest Human-Made Object From Earth

Launched in 1977, Voyager 1 has traveled over 24 billion kilometers from Earth and entered interstellar space in 2012. It carries a Golden Record containing sounds and images of life on Earth, intended as a message to any extraterrestrial civilization that might find it. At its current speed, it will take about 40,000 years to pass near another star system.

The universe is under no obligation to make sense to you. -- Neil deGrasse Tyson

Test What You Have Learned

These 12 facts barely scratch the surface of what is out there. Our science quizzes cover everything from black holes and dark matter to the latest Mars rover discoveries and the history of human spaceflight. Whether you are a casual stargazer or an aspiring astrophysicist, there is a quiz waiting to challenge you.

The best part? Every wrong answer is a new fact learned. That is the beauty of quiz-based learning -- you remember what surprised you, and the universe is full of surprises.