Olympus Mons: The Martian volcano three times taller than Everest

Everest is a pebble. Olympus Mons on Mars is three times taller and roughly the size of France. Its summit actually pokes out of the atmosphere into space.

The secret is Mars’s lack of moving parts. Earth’s tectonic plates shift like a conveyor belt, creating chains of small volcanoes. But the Martian crust is one solid, unmoving shell.

Because the ground stays put, a volcanic hot spot just pukes lava onto the same spot for eons. It’s a vertical stack that never moved, growing until it hit the stars.

Wait, if the ground is an unmoving shell, how does the lava escape?

Think of the Martian crust as a thick, frozen pizza crust. Deep underneath, you've got a 'mantle plume'—essentially a geological blowtorch that’s stuck on high heat. Even though the shell is solid, that heat is relentless. It melts a hole right through the rock, creating a permanent chimney.

On Earth, the 'pizza' moves, so the torch just makes a line of tiny singe marks. But on Mars? The torch stays on one spot for billions of years. It’s not just 'breaking through'; it’s a non-stop fountain of liquid rock building its own exit ramp into the stars.

So why did Mars' conveyor belt break while ours is still running?

Size matters, and Mars is basically a fun-sized Earth. Because it’s smaller, it lost its internal heat way faster—think of a cupcake cooling down on a counter compared to a giant wedding cake.

On Earth, that heat keeps the mantle churning like a boiling pot of soup, which drags our tectonic plates along for the ride. But Mars? It’s a geological graveyard.

The interior cooled so much that the 'conveyor belt' simply seized up. It’s not broken; it’s just frozen solid because the engine ran out of fuel billions of years ago.

Hold on, if the engine died, did the magnetic field just... vanish?

Bingo. When that liquid iron core stops swirling, the planetary dynamo shuts off. No dynamo, no magnetic field. It’s like a lighthouse losing its bulb; the protection doesn't just dim, it’s lights out for the whole neighborhood.

Without that invisible shield, the solar wind—a stream of high-energy particles from the Sun—stripped the Martian atmosphere away like a sandblaster.

Earth has a spinning, molten heart that keeps our shield up. Mars is just a naked rock getting blasted by cosmic radiation because it couldn't keep its internal motor running.

Where does all that 'sandblasted' air actually end up?

It’s a molecular heist. Think of the atmosphere as a crowd and the solar wind as a mosh pit of high-speed protons. When a proton slams into a gas molecule, it transfers enough energy for the molecule to hit 'escape velocity.'

It’s a one-way ticket to the void. Once kicked hard enough, Mars’s weak gravity can't pull them back. They aren't just moved; they are exiled into the interplanetary vacuum forever.

Every second, Mars loses about a quarter-pound of 'air' to this solar bullying. It’s a slow leak that turned a lush world into a freeze-dried desert.