Interesting Facts About Mars
- Mars is the fourth planet from the Sun and is located between Earth and Jupiter.
- Mars is called the “Red Planet” because iron minerals in its soil and rocks oxidize, or rust, giving the surface its reddish appearance.
- A Martian day is called a “sol” and lasts about 24 hours and 39 minutes, making it only slightly longer than an Earth day.
- Mars has two small moons, named Phobos and Deimos. Their names come from Greek mythology and mean “fear” and “dread.”
- Mars has the largest volcano known in the Solar System—Olympus Mons. It rises roughly 22 km above the surrounding plains, about 2.5 times the height of Mount Everest above sea level.
- Valles Marineris is one of the largest canyon systems in the Solar System. It stretches for about 4,000 km across the Martian surface.
- Mars has polar ice caps made primarily of water ice, with seasonal deposits of carbon-dioxide ice.
- Mars has seasons, just as Earth does, because its rotational axis is tilted. However, Martian seasons last longer because Mars takes about 687 Earth days to orbit the Sun.
- Mars has a very thin atmosphere, composed mainly of carbon dioxide, with smaller amounts of nitrogen and argon.
- Gravity on Mars is only about 38% of Earth’s gravity. A person who weighs 60 kg on Earth would experience a weight equivalent to roughly 23 kg under Martian gravity.
- Mars has enormous dust storms. Some can remain regional, while others can grow large enough to spread across much of the planet.
- Sunsets on Mars can appear bluish. Fine dust in the Martian atmosphere causes sunlight near the setting Sun to be scattered differently from Earth’s sunsets.
- Mars once had flowing liquid water on its surface. Evidence includes ancient river channels, lake deposits, deltas and minerals that formed in the presence of water.
- Water still exists on Mars today, mainly as underground or polar ice. Scientists have also detected evidence of hydrated minerals containing water.
- Mars has extremely cold temperatures. Surface temperatures can vary dramatically, with some regions becoming cold enough for carbon dioxide to freeze.
- A year on Mars lasts 687 Earth days, which means Mars completes only about half as many trips around the Sun as Earth does in the same period.
- Mars has a much thinner atmosphere than Earth, so liquid water is generally unstable on the surface under present-day conditions.
- Mars has no global planetary magnetic field like Earth’s. However, parts of its ancient crust preserve evidence of an older magnetic field.
- Mars is home to ancient volcanoes and lava plains, showing that volcanic activity played a major role in shaping its surface.
- Phobos, the larger moon of Mars, is slowly moving closer to the planet. In the distant future, it is expected either to break apart or collide with Mars.
- Deimos is the smaller and more distant Martian moon. It appears much smaller in the Martian sky than Earth’s Moon appears from Earth.
- Mars has blue sunsets but a mostly reddish daytime sky. This is almost the opposite of the familiar blue daytime sky and reddish sunsets on Earth.
- Mars has “dust devils”—spinning columns of dust that can reach considerable heights and leave dark or bright tracks on the surface.
Interesting Facts About Mars
- Mars has the largest known impact basin in the Solar System, Hellas Planitia, a huge depression created by an ancient impact.
- Mars is roughly half the diameter of Earth, making it significantly smaller than our planet.
- Mars has two times as many moons as Earth, but its moons are tiny compared with Earth’s Moon.
- Mars has been visited by numerous robotic spacecraft, including orbiters, landers and rovers. Robotic exploration has dramatically increased our understanding of its geology and climate.
- Mars has organic molecules in its rocks and soil. “Organic” in this context means carbon-containing chemistry; their presence does not by itself prove that life ever existed there.
- Scientists are searching for signs of ancient microbial life on Mars. Ancient environments containing water and potentially habitable conditions make Mars one of the most important targets in the search for past life beyond Earth.
- Mars is one of the most studied planets beyond Earth, and it remains a major target for future human exploration because of its relatively accessible location and evidence that it once had environments capable of supporting liquid water.