Day On Earth Was 19 Hours Long For a Billion Years and The Reason is Very Surprising

Hello and welcome! My name is Anton and in this video, we will talk about the strange period in Earth history when the day was always 19 hours long
#earth #dayonearth #boringbillion

0:00 Intro to discoveries about ancient Earth
1:00 Main focus of the new study
1:25 Brief history of Earth, the Moon and their rotation
5:00 New techniques and new discoveries
6:55 New strange discovery
7:40 Potential explanation
8:55 Questions left unanswered

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[captain_context]

19 hours... Those were the days, huh.

[justmenotyou]

I learned about this as a geology student in the early 80s. It was and is interesting. It was called synodic month and day. The information was obtained from growth patterns in mollusks and stromatolites. You could figure out how many hours in a day and days in a month. Kinda lead down the paloecology pathway.

[sfbuck]

The adaptation to multicellular life as temperatures grew cold makes sense, since larger organisms retain heat more efficiently.

[evilways]

Can always count on you for some interesting stuff Anton.
Thanks for the video...

[jamesdriscoll_tmp]

You pick papers that are interesting., and summarize them well. Thank you!

[ChefVegan]

Great timing. Thanks for your consistency ❤

[carlosnovaes]

Great Anton!! Your videos are very very understandable and we can learn a lot from them!! Tks a Lot!

[barefootalien]

Very good job covering a topic requiring a fair amount of understanding of prerequisite concepts. That's not easy to do, and I _think_ you did it well here.

[FabledGentleman]

What i would give to have the chance to go back and see the earth at that time. And then stand there and contemplate that we humans, will once live there, far far into the future. We humans, we spend so much time of our lives trying to live up to other people's expectations, and no matter what we do, no matter what we achieve, we are so incredibly insignificant.

[mrrob]

Keep the videos coming! It’s my only chance to learn something each day!

[jeremypmerrill]

It seems to me like a snowball earth would be a lot more efficient way of keeping the rotation the same, since there wouldn't be massive tides if all the oceans are covered with ice.

[philips]

Thank you Anton, you always do a great job keeping this interesting and fascinating.

[gregkeet]

Thank you Anton. This topic is intriguing. As a child, i always used to wonder how fast the planet needed to spin to change our gravitational effects and imagined sky scrapers reaching out into space because it was easier to build with less gravity

[suem]

Haha Anton says BILL-ion like Carl Sagan. Awesome.

[srengramgaard]

My Danish teacher at University held the boring billion hours every Monday morning from 8-10😊

[aero]

Can the rotation speed of the earths inner layers not have an effect on the outer crust layer? The crust is just a surface layer that in mass is below 1% of total earths mass.

[patricktilton]

They also need to take into account meteor strikes, and the angles with which they hit the spinning Earth. One strike might serve to INCREASE the Earth's spin-rate, whereas another one -- going 'against-the-grain', so to speak -- might DECREASE the spin-rate. A meteor hit directly at the North or South Pole should have no effect on the rotation rate, though it would, of course, possibly affect the Earth's revolution around the Sun in some way. Those abrupt changes depicted at 7:05 (book-ending the "Mid-Proterozoic resonance-stabilized day length") might have been due to major catastrophic meteor hits, in my opinion.

[chaptermasterpedrokantor]

A boring period may just be the perfect time to live in. It is not for nothing that the Chinese have a curse that says may you live in interesting times.

[przemyslawgacia]

Question / Idea... "What if" snowball earth during that period had so little liquid water that the tidal effect on the moon was neglectable?

[jensonee]

it would be the best of worlds if all we had to concern ourselves with are shows like Anton's, Space Time with Matt, scishow, it's okay to be smart.... instead of the problems caused by greed.