Why Did The Earth Totally Freeze For 100 Million Years?

REFERENCES: news.mit.edu/2020/sunlight-triggered-snowball-eart… royalsocietypublishing.org/doi/epdf/10.1098/rsbm.1… www.snowballearth.org/capcarbs.html pubs.geoscienceworld.org/gsa/geology/article-abstr… pubs.geoscienceworld.org/gsa/geology/article-abstr… www.climaterealityproject.org/blog/how-feedback-lo… pubs.geoscienceworld.org/gssa/sajg/article-abstrac… www.frontiersin.org/articles/10.3389/fpls.2021.735… www2.palomar.edu/anthro/homo2/mod_homo_5.htm www.metmuseum.org/toah/hd/lasc/hd_lasc.htm#:~:text… web.gps.caltech.edu/~jkirschvink/magnetofossil.htm… maglab.caltech.edu/ web.gps.caltech.edu/~jkirschvink/pdfs/Kirschvink_I… web.gps.caltech.edu/~jkirschvink/kirschvink.html link.springer.com/article/10.1134/S002449020901006… gtr.ukri.org/projects?ref=NE%2FH004645%2F1 theconversation.com/how-many-ice-ages-has-the-eart… sruk.org.uk/the-dating-game-how-do-we-know-the-age… www.climaterealityproject.org/blog/how-feedback-lo…

G.K. Chesterton suggested that the cave paintings might have been decorations created to delight the children of the tribe who used the cave as a nursery for young children forced to stay indoors through the long, bitter winters. I like that about Chesterton. He had a gift for pointing out the possible similarities between ancient peoples and modern humanity, instead of highlighting their differences.

You literally make nat geo quality videos. You do it with almost no budget no huge team and no army of editors. It’s astonishing. You’re sitting on a lot of money and happiness with those skills.

Minor correction at 17:55: it is probable that Saturn's rings had not yet formed 700 million years ago. They are thought to be only 100 million years old.

Never mind about Earth sitting in the Goldilocks Zone in it's orbit around the Sun, it would seem to be more like a Goldilocks Knife Edge tipping between Snowball Earth and a runaway Greenhouse Earth. This would in turn promote the Rare Earth hypothesis and Enrico Fermi's paradox would be seen as being more profound.

To clear up a common misconception about comets at 17:35, comets do not actually leave a "tail" behind them as they travel. In the vacuum of space there is no atmospheric drag. When astronauts conduct a space walk, their ship does not zoom ahead and leave them trailing behind. Solar radiation from a nearby star sublimates (defrosts) the comet's frozen surface, and those sublimating particles are pushed in the same direction as the solar radiation. So the direction of the tail is entirely independent of the comet's trajectory.

History of the Earth videos are drop everything and watch asap.

Because someone left the fridge door open.

The flaw in Budyko's model is that there is no hydrologic cycle. He can't be blamed for this. He had 1969 computer technology to work with, and he had to make many simplifications. What would really have happened with a 1.6% reduction of the solar constant is that some areas would remain ice-free because sublimation exceeded snowfall and deposition, so even with low temperatures, areas of the earth would have low albedo, and this would be the reversal mechanism once solar radiation increased again.

In france we pronounce "Lassko" when talking about this place (the Lascaux cave / les grottes de Lascaux) Not a critic .. just to add precision for those interested ! ❤ love the channel 2 episodes in a few days is a real treat! Thanks!

I remember reading in the awesome kids' science magazine Muse about the Snowball Earth era when it was a relatively new theory. The notion of an earth frozen over from pole to pole has haunted my dreams ever since...

This is a strange thing to bring up, but you mentioned Douglas Mawson and our previous $100 note here in Australia used to have his image on it. It was my favourite because (yes, I didn't mind a $100 note) I loved the way his image was drawn with his woollen head covering, which had many intricate lines. Strange things you remember 🤷🏻‍♀️

There is an area in the south of Western Australia which is like the Bermuda triangle. Compass readings are incorrect . The Navy used to use landmarks for navigation . Radio waves are also affected. Rocks with obvious signs of iron show readings of directions are completely different from the current magnetic poles. It is so interesting and I believe that it's very important.

I love love love that people who are technical experts put their corrections in the comments so that I can look things up if I want and I get to learn. The fact that we can get 50 min vids with a handful of corrections is pretty impressive.

YOU'RE BACK! I shouldn't comment until I've watched it through, but it's always such a special treat when another episode arrives. These are without a doubt my favorite thing on YT, so I have no doubt they take an awful lot of work to research, write, and produce. Now, time for a cup of tea and another chapter from my favorite story: you always manage to uncover great anecdotes and new discoveries about your chosen topic that i haven't run across before. Thank you.

Beautifully photographed and meticulously edited and narrated ... a terrific presentation. Thank you.

Is it possible that somehow a close flyby of a large object altered the spin or position of planet earth enabling the warming up of the planet ?

We have found microbes kilometers deep, living in solid rock - endoliths. If they were around back then too, even the thickest ice sheet on the entire earth would hardly have an effect on them. An existential threat to life at that stage and beyond, would have to basically melt earths entire crust. So yeah... nothing less cataclysmic than the moon falling onto earth poses a threat to life as a whole.... certainly not a mere surface nuisance like an ice age 😄

I thought I was watching natgeo or something and didn't realize it was a tiny YouTube channel that deserves FAR MORE subs than what they have!

It's top notch quality : it's well documented, well written, well narrated, well illustrated.