Categories
Science

Our water came from space dust

Watched Where Did Water Come From? from YouTube

Mercury, Venus, and Mars are all super low on water – so where did ours come from and why do we have so much of it? We think our water came from a few unlike…

Sooo cooool 😯

Also a ton of Earth’s water is IN ROCKS 🤯

 

Categories
Science

How airport runways are numbered

Watched The Simple Secret of Runway Digits from YouTube

Numbered based on compass bearing, abbreviated…but because it uses magnetic north those bearings sometimes change

Wind usually blows in the same or a couple directions, so usually works to build runways for those main wind directions

Coriolis Effect in both atmosphere and molten core

Earth is like a giant electromagnet –> magnetosphere

Iron cells are like miniature electromagnets

Earth’s magnetic field has dropped 10% in the last couple hundred years