and heading towards Earth are pretty accurate

and heading towards Earth are pretty accurate.

Wisecrack

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Moon Fall Down? 

The new movie Moonfall imagines what would happen if the moon got knocked off its axis and sent towards earth. So is this actually possible? And could we survive? Let's find out in this Science is Hard: What if the Moon Fell Down to Earth? 

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00:00 - Intro
01:12 - Moon Fact
03:58 - A World With No Moon
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What if the Moon Fell Down to Earth? | Science Is Hard

Her results which are completely accurate I need to note repeatable peer science not my opinion

Her results, which are completely accurate I need to note, repeatable peer science, not my opinion,

Rare Earth

Edit: Sal*SI*puedes, not sal*IS*puedes, you dumb Canadian.

In case it isn't clear to some through the text, I believe in Charruan rights. I believe in the rights of people in Uruguay to look to their heritage for support and guidance. I believe in the value of the state recognizing and understanding the reality of the blood and history of all their people.

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Are the Charrúa Extinct?

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Why Aren't Laptops HEAVY Anymore?

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2021 Yearly Review & Future Plans (live)

where they’re already accurate and better where  they’re in conflict is very high level stuff

where they’re already accurate and better where  they’re in conflict is… very high level stuff.

minutephysics

Go to https://curiositystream.com/minutephysics to get access to CuriosityStream AND Nebula (where you can watch the extended version of this video), plus you'll get a 26% discount on an annual subscription.

This video covers the General theory of Relativity, developed by Albert Einstein, from basic simple levels (it's gravity, curved space) through to the concepts of how curved spacetime is represented by psuedo-Riemannian manifolds with Lorentzian signature (that is, special relativity and minkowski space are the local tangent space), how matter and energy are represented by an energy-momentum tensor, and how these two together obey the Einstein Field Equations. The solutions to the Einstein Field Equations (including the schwarzschild metric, kerr metric, freedman-lemaitre-robertson-walker metric, etc) represent gravity around massive objects like the sun, earth, and black holes, but also the history and expansion and future evolution of the cosmos. The universe on a large scale is described by general relativity - on a small scale, quantum mechanics. And where they meet... there's still work to be done.

REFERENCES
Wald's textbook - General Relativity
Hartle's textbook - Gravity: An Introduction to Einstein's General Relativity

Carlo Rovelli History of Quantum Gravity: https://cds.cern.ch/record/442809/files/0006061.pdf

Leon Rosenfeld 1930 paper on quantum gravity: http://www.edoc.mpg.de/438547

Kerr Metric Solution - https://en.wikipedia.org/wiki/Eddington%E2%80%93Finkelstein_coordinates
Schwarzschild Metric - https://en.wikipedia.org/wiki/Schwarzschild_metric

Eddington-Finkelstein Coordinates - https://en.wikipedia.org/wiki/Eddington%E2%80%93Finkelstein_coordinates

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General Relativity Explained in 7 Levels of Difficulty

stare up at a bright, full moon, and think to yourself,

seems to be playing right into my biggest fears

where the whole damn moon gets knocked off its orbit

and literally starts falling towards Earth.

Along the way, it causes a grab-bag of damage:

deaths, tidal waves, gravitational shifts, and the like.

Now, I'm not here to spoil the movie for you,

because that would be what scientists call,

that the moon could ever be thrown off its axis

like a bowling ball thrown by a drunk and vengeful God?

Science is Hard: Is real-life Moonfall possible?

To begin with, let's get some basic moon facts straight.

The moon is in an elliptical orbit around the Earth.

It's distance from Earth ranges from 362,600

to 405,400 kilometers at any given point.

this could cause the moon's orbit to stretch out

as the force of the object slows it down.

it's actually because of cold hard science:

of the moon and Earth's respective orbits,

speed, and rotation, plus the gravitational pull

And if the moon gets knocked off its orbit,

the difference between the minimum and maximum distances

between the moon and Earth would increase,

Along the way, it would also increase the difference

and create way bigger and scarier tidal waves.

Good for surfers, bad for the rest of us.

its orbit would get more and more elliptical,

The friction created would slow it down even further,

and the moon would eventually crash into our planet

The Roche Limit holds true for any satellite,

i.e. an object orbiting something like a planet.

where the gravity holding a satellite together

is weaker than the tidal forces trying to pull it apart.

Now, the moon was formed around 4 1/2 billion years ago

When this happened, they melted into each other

which is kinda romantic when you think about it.

And the moon was a piece that spun off from this new mass,

thus furthering this intergalactic fairy tale.

And when a satellite has the same make-up as a primary body,

i.e. when the moon baby is descended from its parent planet,

the Roche Limit is about 2 1/2 times the radius

This means that if the moon's orbit reached 11,470 miles

tidal forces would tear that little rascal apart,

But in this case, not all the pieces of our blasted-up moon

as some pieces will be pulled in by Earth's gravity.

If they then survive the fall through our atmosphere,

they'll absolutely wreck a few major cities in the process.

Test your pronunciation!

“accurate”