Only half the people followed the directions. But, there are some good reads in that thread, if you would also like to r

One of the most important contributions of Roger Penrose to black hole physics is the demonstration of how a realistic object in our Universe, such as a star (or any collection of matter), can form an event horizon and how all the matter bound to it will inevitably encounter the central singularity. (NOBEL MEDIA, THE NOBEL COMMITTEE FOR PHYSICS; ANNOTATIONS BY E. SIEGEL)

Although it would take some sort of magical process, such as instantaneously replacing Earth’s matter with dark matter or somehow turning off the non-gravitational forces for the material composing Earth, we can imagine what would occur if we allowed this to happen.

If, somehow, the electromagnetic and quantum forces holding the Earth up against gravitational collapse were turned off, Earth would quickly become a black hole. Here’s what we would experience if that were to happen.

“As these workers flee the expensive coastal cities they’ve been golden-handcuffed to, Austin could find itself inheriting an entirely new class of workers who don’t actually work here,” writes Bluestein. “People won’t necessarily be flocking to Austin for jobs, but for all the other reasons they’ve been coming here at a rate of 150 people per day since 2010 — including no state income tax and a median home price of $405,000, compared to $1.3 million in San Francisco. Now, they’re just bringing their jobs along with them.”

If you begin with a bound, stationary configuration of mass, and there are no non-gravitational forces or effects present (or they’re all negligible compared to gravity), that mass will always inevitably collapse down to a black hole. It’s one of the main reasons why a static, non-expanding Universe is inconsistent with Einstein’s relativity. (E. SIEGEL / BEYOND THE GALAXY)

“As these workers flee the expensive coastal cities they’ve been golden-handcuffed to, Austin could find itself inheriting an entirely new class of workers who don’t actually work here,” writes Bluestein. “People won’t necessarily be flocking to Austin for jobs, but for all the other reasons they’ve been coming here at a rate of 150 people per day since 2010 — including no state income tax and a median home price of $405,000, compared to $1.3 million in San Francisco. Now, they’re just bringing their jobs along with them.”

In the cores of stars that are massive enough, however, neither the electromagnetic force nor even the Pauli exclusion principle can stand up to the force inciting gravitational collapse; if the core’s radiation pressure (from nuclear fusion) drops below a critical threshold, collapse to a black hole becomes inevitable.

One of the most remarkable facts about the Universe is this: in the absence of any other forces or interactions, if you start with any initial configuration of gravitationally bound masses at rest, they will inevitably collapse to form a black hole. A straightforward prediction of Einstein’s equations, it was Roger Penrose’s Nobel-winning work that not only demonstrated that black holes could realistically form in our Universe, but showed us how.

“We’re betting that the future of America is going to be built in the middle of the country, in places with good government and a reasonable cost of living. In other words, places like Texas.”

As it turns out, gravity doesn’t need to be the only force: just the dominant one. As the matter collapses, it crosses a critical threshold for the amount of mass within a certain volume, leading to the formation of an event horizon. Eventually, some time later, any object at rest — no matter how far away from the event horizon it initially was — will cross that horizon and encounter the central singularity.

Not even $3.6 billion worth of committed capital will keep top VCs in Silicon Valley anymore. Founding partner of 8VC, co-founder of Palantir, and lifelong Californian Joe Lonsdale wrote an op-ed for the Wall Street Journal explaining his decision to move to Texas, “the new land of opportunity.” He joins a growing diaspora of disenchanted tech entrepreneurs fed up with San Francisco’s crumbling infrastructure and bureaucratic policies. As Adam Bluestein wrote in Marker back in July, this exodus bodes well for cities like Austin, which was already on its way to becoming the de facto, secondary outpost for tech talent before the pandemic hit in early March — and is likely to benefit from the remote work boom.

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r that moment, but fifteen years later, it still results in a series of belly-laughs. It’s the small, unexpected moments we remember most fondly. We can’t plan or predict them, but we can give them a chance to happen by spending time with people we enjoy.

First off, the material composing the solid Earth would immediately begin accelerating, as though it were in perfect free-fall, towards the center of the Earth. In the central region, mass would accumulate, with its density steadily rising over time. The volume of this material would shrink as it accelerated towards the center, while the mass would remain the same.

If a black hole were to appear between the Earth and an observer, the Earth would appear gravitationally lensed in a fashion similar to this, dependent on the Earth’s position relative to the black hole and the observer. If a black hole were to form from the Earth itself, it would create an event horizon just 1.7 centimeters in diameter. (ANDREW HAMILTON / JILA / UNIVERSITY OF COLORADO)

Right now, the reason Earth is stable against gravitational collapse is because the forces between the atoms that make it up — specifically, between the electrons in neighboring atoms — is large enough to resist the cumulative force of gravity provided by the entire mass of the Earth. This shouldn’t be entirely surprising, as if you considered the gravitational versus the electromagnetic force between two electrons, you’d find that the latter force was stronger by about a factor of a whopping ~10⁴².