The energy that makes you burn up is your own kinetic energy. The “small” deorbit burn slows you down just enough to touch the atmosphere, but you’re still going nearly full speed: 7200 m/s. Around 30,000 km/hr.
If you slow down more in space, so that you enter the atmosphere at low speed, you don’t burn up. But you need a whole lot more backpacks to handle the full speed. It’s cheaper and burns less gas if you use the air to slow down.
It seems difficult to have enough bottled oxygen to deorbit yourself, but maybe doable.
The MMU backpack units on the space shuttle had a total delta v of ~30 m/s. You need about three times that amount to deorbit from ISS. So imagine you need 3 MMUs give it take worth of expendable propellant oxygen, and you can do it. (The MMUs used nitrogen, but for this purpose oxygen is pretty much the same.)
After you deorbit, you will of course burn up on re-entry with no heat shield. But it might be conceivable to design a personal heat shield surfboard.
You could also avoid the whole burning up things by braking a lot more during the deorbit maneuver. But instead of 100 m/s, you need to slow down by more than 7000 m/s. That’s quite a few more MMUs worth of gas. But if you do that, then you’re essentially making a free fall jump from space, which has more or less already been demonstrated.
Edit:
To address the linked article in some way: each astronaut on the station has a dedicated seat on a capsule to come back down in an emergency. Usually, it’s the same space capsule you came up on, but not always. Those are maintained ready to go at all times, and the astronauts can be back on the ground in 60 minutes whenever they need to. These spacecraft can be operated to splashdown by astronauts alone with no ground assistance, if needed.
No. For several reasons.
Fortran is older than Basic and C. In fact, Fortran is more or less the first high level programming language. The first Fortran compilers date to the early 1950s.
Fortran was created mainly for the purpose of linear algebra: operations with (giant) matrices. Linear algebra is used to compute approximate solutions to ordinary and partial differential equations, and this is a major part of what people needed computers for (and still do).
Programming concepts like subroutines, functions, if statements with blocks and else clauses… All of those were not in original Fortran because no one had thought of them. These things entered Fortran over time as they became popular, and goto slowly became less popular. Syntax from the punch card era was replaced in Fortran 90, but it is still available as an option for compatibility purposes.
Structurally, I prefer to describe Fortran as like C, but with better built-in arrays, and no built-in general purpose pointers. Not having the pointers allows the compiler to do certain optimizations that C can’t. But C is the better systems language, because the pointers let you naturally express all kinds of data structures besides arrays.
Better known for other work.
The statutory penalty in the US is on the order of $100,000 per infringement. “Statutory” means that the number is written into the law, and the aggrieved party doesn’t have to establish or prove actual losses.
Your common sense prevents you from doing that.
You have:
No tea
I do like me some salami on toast.
Medical device programmers:
Let’s go, Rule of law.
https://en.m.wikipedia.org/wiki/Binary_black_hole
The two event horizons stretch out toward each other, form some interesting shapes, connect into a cylindrical bridge shape, and then the combined horizon smooths itself out while emitting large amounts of gravitational radiation.
For “realistic” scenarios where these black holes start out in a binary elliptical orbit, the final ringdown phase concludes very rapidly. Gravitational waves are emitted continuously during the inspiral phase, in a manner analogous to how an electron in a circular orbit emits electromagnetic radiation.
The event horizon itself is a mathematical boundary of neither matter nor energy, so it does not appear to slow down or stop from time dilation. (From the perspective of a distant outside observer).
The no-hair theorem applies to stationary black hole solutions. That is, after event horizon ring down is completed.
Editing myself to directly answer the information question:
If you observe an event horizon on a complex distorted bridge shape, you can deduce information about the original merger partners. This is not a violation of any principle, because the famous no hair theorem does not apply in this situation.
The complex shape condition is not stable, and it relaxes to a “simple” shape that provides no information about the individual merger partners. This process completes in finite time, and is usually quite fast.
During this process, undulations and ripples in the shape of the event horizon result in emitted gravitational waves. Presumably, these gravitational waves contain the last information you can possibly get about the original merger partners.
Second edit: I am not a physicist, but I can read Wikipedia. Feel free to correct me.
I feel like he missed a solid opportunity to use the word “geometers.”
Also, on Gentoo Linux, there will be an ebuild that integrates all of the cmake options into the rest of the packaging system and manage the dependencies
I preferred the Facebook group “If 2,147,483,648 people join this group, then an integer overflow may occur” back in the day.
Lai micromanaged her time and only allowed her to sleep for a few minutes over the course of four days leading up to the event. Further abuse included imposing daily Christian worship, forcing Sydney to write lines like a schoolchild, daily check-ins over WhatsApp of her outfits as part of “quality control”, and humiliating her in front of colleagues.
Okay. This shit has nothing to do with productivity. That is not putting anyone “in the zone.”. This is not “crunch” culture. This is just straight-up chauvinistic misogynist bullshit.
The ghost movement is not random. They go in memorizable patterns. So it is possible to simply rote memorize the solution to all 256 levels or something.
Backpage moderated some posts, sure. But what was the role of Salesforce here besides supplying a software package?
The altimeter setting should be referenced to sea level as well. Which means it doesn’t agree with the SLP.
And for reference, the earth escape velocity from the surface is 11.2 km/s or 25,000 mph, not 7,000 mph.
To escape the solar system from the earth surface, the minimum speed is 16.6 km/s, or 37,100 mph. But this assumes that you launch in the correct direction to take the most advantage of the Earth’s 30 km/s. If you launch in the most disadvantageous direction, you can add another 60 km/s to escape.
Rockets do not aim straight up when they are leaving. They go straight up for a few seconds, and then they tilt over in the desired direction to pickup speed.
They don’t burn up on the launch because they time the tilt over maneuver so that they get above nearly all of the atmosphere before they start picking up serious speed.