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The two interact gravitationally in weird and subtle ways - I've written a fairly thorough explanation of it - but in a nutshell the gravity of the Moon stretches the Earth, causing the tides. The Moon heats the Earth even today, though only a wee bit, through tides. EdBj1TS1r2- René Heller aka November 26, 2021 This heat could have supported the early #habitability of our planet. Today, the Moon is over 60 Earth radii away! Tides in the Earth pushed the Moon outward, while the Earth was heated. When the Earth's #Moon formed, it was just about 4 Earth radii away. In a new paper, a team of scientists proposes a significant source of heating may have been the Moon. It's not at all clear what that source may have been, though. Some ideas put forth are excessive greenhouse gases in the atmosphere a more massive young Sun which would've made it hotter back then, with the mass lost through a more powerful solar wind radioactive elements inside the Earth adding heat and more. There must have been some other source - or more likely, sources plural - of heat to keep the Earth clement. This is called the Faint Young Sun Paradox. Somehow, Earth's temperature remained somewhat stable over the eons despite the Sun getting hotter. The surface should've been frozen.īut we see lots of evidence of liquid water from back then minerals and rock formations that indicate they were submerged when they formed. That means Earth wasn't receiving nearly as much heat then as it is now. Around the time the Moon formed, roughly 70 million years after Earth did, the Sun was only about 70% as luminous as it is today, getting warmer and brighter by roughly 6% every billion years. The thing is, stars like the Sun get hotter with age. Certainly after a Mars-sized planet whacked us but good and formed the Moon, the Earth was heated substantially again.
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When the Earth was very young, a few million years after it first formed, it was very hot. This, it turns out, may also help solve a long-standing and pernicious astronomical problem: Why wasn't the Earth frozen solid when it was young? Shortly after it formed it was much, much closer to Earth, and would have appeared 15 times bigger in the sky than it does now. Your brain is tricking you into thinking it's bigger than it really is.īut, if you had seen the rising Moon, oh, say, 4.4 billion years ago, it would've been immense on the horizon. Sometimes the rising Moon looks huge over the horizon, big enough that you could almost fall into it.