There are a few ways to rumble the red planet.
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NASA is about to launch InSight: a new R10 billion ($850-million) Mars lander that will probe the red planet's secrets like never before.

InSight is slated to lift off on Saturday, which is one day after International Space Day, on May 4. But it's just one of dozens of robotic and satellite missions that humanity has rocketed to Mars over the decades.

These spacecraft have beamed back dazzling photos, inspired sci-fi movies like "The Martian", and even helped give Elon Musk, the founder of SpaceX, the idea to colonize the red planet with the Big Falcon Rocket.

While scientists readily admit they have much to learn about Mars, including the planet's internal structure (a mystery InSight will try to solve), what we have found out so far is incredible.

Here are 13 fascinating facts about Mars and our robotic exploration of the red planet.

Mars quakes

Mars is a small planet compared to Earth.
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The red planet doesn't have plate tectonics, which is what causes most quakes on Earth. But rising plumes of magma could trigger Mars quakes, as could meteorite impacts and the contraction of the world due to cooling. InSight will listen for them with its seismometer.


Surface Area

On average, Mars is a frigid planet because it has almost no atmosphere.
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Mars has almost as much surface as Earth has land — but that doesn’t account for the 71% of Earth that’s covered in water.


Temperature

Mars' thin atmosphere is mostly carbon dioxide (CO2), nitrogen (N2), oxygen (O2), and argon (Ar).
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The average surface temperature on Mars is -62.7 C (-81°F), 58.8 C (138 degrees) colder than on Earth.


Atmosphere

The Grand Canyon has nothing on Valles Marineris.
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The Martian atmosphere is 61 times thinner than Earth’s, and it consists almost entirely of carbon dioxide, which makes up just 0.04% of Earth’s atmosphere.


Canyons

Mars didn't have a lot of water.
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Valles Marineris is nearly five times deeper, about four times longer, and 20 times wider than the Grand Canyon.


Ancient oceans

Pools of water could be where life on Mars got its start.
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Mars once had oceans, but adding them up would give you just 1.5% of all water on Earth.


Oasis

You wouldn't want to get hit with an ancient Martian tsunami.
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If aliens existed on Mars, they might have lived in oasis-like pools. These pools would have been habitable for life, just as they are on Earth.


Tsunamis

Melting Mars' ice caps would help terraform the planet into a cozy world.
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Martian oceans also had tsunamis like those on Earth. The tallest may have reached as high as 400 feet, just slightly shorter than the London Eye.


Ice Caps

Volcanoes on Mars dwarf those on Earth.
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Like Earth, Mars has ice caps at its poles. The northern cap is up to 2 miles deep, is a mix of water and carbon dioxide, and covers an area half the size of South Africa.


Volcanoes

Missions to Mars have waxed and waned over the decades.
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Olympus Mons is more than twice as high as Hawaii's Mauna Loa.


Launch rate

Mars is hard.
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Missions to Mars have become much rarer — after 23 launches in the 1960s and 1970s, we’ve launched just 10 in the new millennium (so far).


Missions

Sunsets on Mars are blue.
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Getting to Mars is hard: About a third of the missions launched have failed.


Sunsets

Mars is one of the most-visited yet mysterious planets in the solar system.
Samantha Lee/Business Insider

On Earth, sunsets are a brilliant mix of reds, pinks, oranges, yellows, and other colors. But on Mars they're blue. The reason: Air is about 1/100th as dense on the surface of Mars than it is on our planet. This refracts white sunlight less, leading to fewer colors (primarily blues). 

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