20 Mind-Blowing Fun Facts About Mars
Some of these you've probably heard. Quite a few of them you definitely haven't.
Mars is one of the most fact-rich planets in the solar system, and there's no way to fit all of it into one page. So here are 20 of the most surprising, mind-bending and oddly specific things about the Red Planet, in no particular order.
1. The Tallest Mountain in the Solar System Is on Mars
Olympus Mons is 22 km tall — almost three times the height of Mount Everest. Its base would cover the U.S. state of Arizona. If you tried to climb it, you wouldn't even see a mountain shape, because the slopes are so gentle and the volcano is so wide that the curve of Mars itself hides the peak from view.
2. The Biggest Canyon in the Solar System Is Also on Mars
Valles Marineris stretches 4,000 km across Mars's equator — long enough to span the United States. It's up to 7 km deep, ten times longer and four times deeper than the Grand Canyon. From space, it looks like Mars has been scratched.
3. Phobos Rises in the West
Phobos, Mars's bigger moon, orbits so fast that it laps Mars's rotation. From the surface, it appears to rise in the west and set in the east — three times every Martian day. It's the only moon in the solar system that does this.
4. The Sky on Mars Is Pink During the Day
Earth's sky is blue. Mars's sky is butterscotch-pink. The fine red dust constantly floating in the Martian air scatters yellow and red light in all directions, giving the daytime sky the color of weak tea.
5. Sunsets on Mars Are Blue
While the daytime sky is pink, the sky around the Sun at sunset turns blue. The dust scatters blue light forward toward the Sun, which is the opposite of what happens on Earth. NASA's rovers have photographed Mars sunsets many times, and the blue glow is unmistakable.
6. A Day on Mars Is Almost the Same as a Day on Earth
One Martian day — called a sol — lasts 24 hours and 37 minutes. Just 37 minutes longer than ours. Out of every planet in the solar system, Mars's day is the closest match to Earth's.
7. A Year on Mars Is Almost Two Earth Years
Mars takes 687 Earth days to orbit the Sun. That means a 10-year-old on Earth would be roughly 5 Mars years old. An entire 80-year human lifetime is about 42 Mars years.
8. The Sun Looks Smaller From Mars
The Sun appears about two-thirds the size from Mars compared to Earth, because Mars is so much farther away. Sunlight on Mars is also dimmer — about 60% as bright as on Earth.
9. There's Rust Everywhere
Mars looks red because the iron in its rocks and soil has rusted. Iron + oxygen = iron oxide, the same stuff that grows on a bike left out in the rain. Mars has been rusting for billions of years.
10. The Latest Research Says Mars Was Wet When It Rusted
For decades, scientists thought Mars's red color came from a dry, hot rusting process. New research from 2025 suggests the iron oxide is mostly ferrihydrite, a mineral that only forms when water is around. So Mars's rust is itself a clue that it used to be wetter.
11. Phobos Will Crash Into Mars (Eventually)
Phobos is slowly spiraling closer to Mars at about 1.8 meters per century. In about 50 million years, Mars's gravity will rip it apart. The pieces could form a thin Saturn-style ring around Mars before slowly falling to the surface.
12. Mars Has Four Seasons
Mars's axis is tilted at 25 degrees, almost the same as Earth's 23.4 degrees. So Mars has spring, summer, autumn, and winter — they just last about twice as long because the year is twice as long.
13. NASA Has Already Made Oxygen on Mars
The Perseverance rover carries a tool called MOXIE that converts Mars's carbon dioxide into pure oxygen. So far it's made over 100 grams of oxygen. Tiny — but it proves the chemistry future astronauts will need.
14. Ingenuity Was the First Aircraft on Another Planet
The Ingenuity helicopter, which flew with Perseverance, took its first flight on Mars on April 19, 2021. It was supposed to make 5 test flights. It ended up flying 72 times before retiring in January 2024.
15. There Are Mars Rocks on Earth
More than 30 confirmed Martian meteorites have been found on Earth. They got here when ancient asteroid impacts on Mars blasted chunks of the surface into space, and some of them eventually drifted into Earth's path. The most famous one, called ALH84001, was found in Antarctica and once made global headlines for possibly containing fossilized Martian microbes.
16. Mars Has Dust Devils Several Kilometers Tall
The dust devils that occasionally spin across the Martian plains can grow much bigger than ours — some reach over 10 km tall. Rovers have caught them on camera many times, twisting across the surface like skinny tornadoes.
17. There Are "Spider" Patterns on Mars
Strange dark spider-shaped patterns appear on Mars's south polar region every spring. They're not actually spiders — they're cracks where carbon-dioxide gas explodes out from under thawing dry ice, kicking up dust in spider-leg-shaped streaks. Scientists call them araneiform terrain.
18. The Month of March Is Named After Mars
Yes, really. March is named after the Roman god Mars, who was honored at the start of the campaigning season — when Roman armies came back out after winter to fight wars. The planet and the month share the same name origin.
19. Half of All Mars Missions Have Failed
About 50 spacecraft have been sent toward Mars since 1960, and roughly half never made it. Mars has crashed, lost contact with, or otherwise destroyed an enormous number of missions over the decades. Engineers sometimes joke about the "Great Galactic Ghoul" that eats Mars probes.
20. There's a Calendar Just for Mars
Astronomers use a special Mars Year calendar to keep track of dates on the Red Planet. It started counting in 1955, which became Mars Year 1. We're currently in Mars Year 38. Each Mars Year is 687 Earth days long.
Bonus weirdness: Because Mars has dust storms that go global and dust devils that go vertical, the dust on Mars's surface is constantly being lifted, transported and dumped somewhere new. The whole planet very slowly redecorates itself over centuries.
If even half of these blew your mind, the rest of the Mars hub goes deeper into pretty much every one of them. Start with the main Mars Facts for Kids page, or jump into one of the topic pages below.
Frequently Asked Questions
What is the most amazing fact about Mars?
Probably Olympus Mons. It's the tallest volcano anywhere in the solar system, standing about 22 km tall — nearly three times the height of Mount Everest. Its base would cover the U.S. state of Arizona, making it as wide as a small country.
Is Mars rusty?
Yes, literally. Mars's surface is covered in iron-rich dust that has reacted with oxygen over billions of years to form iron oxide — the same stuff we call rust on Earth. That's where the planet's red color comes from.
What is the strangest thing on Mars?
It's a tough call between several. The 'spider' patterns near the south pole are pretty surreal — they're caused by gas exploding out from under thawing dry ice. Phobos rising in the west is also amazing. And the fact that Mars sunsets are blue while the daytime sky is pink is genuinely the opposite of Earth.
Are there really Mars rocks on Earth?
Yes. More than 30 confirmed Martian meteorites have been found on Earth. They were blasted off Mars by ancient asteroid impacts and eventually fell to Earth millions of years later. Scientists can identify them by the unique chemistry inside the rocks.
Is Mars getting rings?
Possibly, in about 50 million years. Mars's bigger moon Phobos is slowly spiraling closer to the planet, and eventually it will be torn apart by Mars's gravity. The pieces could form a temporary ring around Mars that lasts hundreds of millions of years.