What have we yet to learn about Earth?

Started by Legend, Aug 16, 2019, 05:27 AM

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I really like UFO sightings and it's a well known joke to say they are just strange weather phenomenons, but that's probably the truth the majority of the time. Weather is weird and there is a lot we still do not know about it.

These are Red Sprites. This is a real photo taken just over a week ago (source). As Wikipedia puts it, sprites occur in the upper atmosphere above thunderstorms.

They look freaking weird and weren't discovered scientifically until the 20th century. Lots is still unknown about them. Here's a video showing more about them.

A much more elusive weather phenomenon is ball lightning.

It's weird and essentially nothing is known about it so here is wikipedia.

So I'd say there is still a lot we need to learn about our weather. What are some things you all think still hold some secrets here on Earth?