How We Discovered Earth’s Hidden Solid Core #spacesuccess #rain #siliceous #innercore #universe

Added: 2026-05-25

[00:00:00]The day the deepest hole humans ever dug reaches only about 2/10 of a percent toward Earth's center.

[00:00:07]So, how did we uncover Earth's molten oceanic [music] interior? But in 1929, a huge earthquake in New Zealand changed everything.

[00:00:17]The quake sent seismic waves racing through the Earth in every direction.

[00:00:23]Danish scientist Inge Lehmann studied those waves [music] carefully and noticed something strange.

[00:00:30]Some waves were bending and bouncing in ways they shouldn't. After doing the math, Lehmann realized the only explanation was this.

[00:00:39]Inside Earth's [music] liquid outer core, there had to be a solid inner core.

[00:00:44]Modern scientists later confirmed her discovery using advanced computers and highly sensitive seismic recordings. And they uncovered something even more shocking.

[00:00:55]Earth's inner core rotates at a different speed than the surface above us.

[00:00:59]Scientists now [music] think the core follows a roughly 70-year cycle of speeding up and slowing down.

[00:01:06]And right now, it may actually be slowing down. A hidden metal sphere spinning beneath our feet, discovered without ever [music] seeing it directly.

[00:01:16]A testament to human curiosity.

[00:01:19]Follow for more fascinating