00:00The largest volcano in our universe isn't on Earth, it's on Mars.
00:03Imagine you dig a hole straight down from the top.
00:05It's three times taller than Mount Everest, and its base is about the length of Portugal.
00:09Then you're digging through Mars' crust.
00:10Scientists recently discovered huge amounts of liquid water hiding in this crust.
00:14But it's too deep for a Mars colony to get to, for now.
00:17After about 50 kilometers, you'd hit Mars' mantle.
00:19It's cooler than Earth's and less active.
00:21We don't think Mars has much volcanic activity, but it seems like it used to.
00:25Keep digging, and finally you'd hit a dense molten metal core,
00:28about half the size of Earth's.
00:30We think it used to be flowing like Earth,
00:32so Mars likely had a magnetic field like we do.
00:35But the flow stopped, and we aren't totally sure why.
00:38And while our first estimates using seismic waves told us the core was fully liquid,
00:41new studies are suggesting that Mars might have an inner core that's solid, like on Earth.
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