Mainly the distance to the next black hole.

The closest Black hole is 1.566 Lightyears away from us. That's 99035 AUs

The furthest object we were able to send into space is Voyager-1, which got to 159AU in 45 years.

So, the closest black hole is 622x further away and would have taken Voyager-1 about 28,000 years to get there.

Which means, if we send a probe now, it will arrive at the black hole around the year 30,000

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And if this happens on Earth it wouldn’t do it that much since molecules aren’t no where near as spread as in space correct?

Interesting… in fiction like Star Wars and Metal Gear Solid there exist “Vibro Blades” that vibrate so fast they glow white hot. So I know vibration creates heat but I didn’t know how it differs in space.

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How does competition create sexual dimorphism?

> it may take decades to get to one

This is the main problem. It wouldn't take decades to get to one, it would take hundreds of thousands of years.

Voyager is the furthest probe ever launched from Earth. It has been traveling for over 45 years and has made it 0.06% of the way to Alpha Proxima, the closest star to Earth- and it's still slowing down. The closest known blackhole to Earth is 400 times further away from Earth than Alpha Proxima..

Of course, even if we got a probe there, it would have to have more power than any transmitter ever made to communicate with us. Transmission power falls off using an inverse square law meaning you would need ~18 quadrillion times more power to communicate back to Earth from that blackhole than it would take to communicate back from Mars.

And to top it all off, even if we somehow conquered all of that- once the probe actually entered the blackhole (aka- crossed the event horizon) it is physically impossible for it to send us information anyway, since nothing can escape a blackhole's even horizon.

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Sound, as it is conventionally understood, requires a medium to propagate which can reasonably be approximated as a continuum. That isn't true in the vast majority of space. Events like supernovas create shocks, not sound.

Why did we evolve to remove liquid waste from our genitals instead of it being removed from our anus or have the urethra nearer the anus?

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The closest big frozen falls to me seem to slowly form in the first few cold snaps, a bit at a time, and by January this year, look like stalactites.

I did notice there’s a sheen of not yet frozen on it, so it’s making layers.

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Will we ever be able to put people in suspended animation for things like space travel?

Men tend to have much higher neuromuscular efficiency than women. The ability to activate more muscle fibers during contraction. This is mostly due to testosterone exposure during gestation.

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> And why shouldn't indirect contact be suitable? Hold it in your teeth for example.

Don't do that, you don't need to do that. Just hold it to your temple, or any nearby area where there is bone just under the skin.

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> You would then die painfully over a few minutes from exposure to vacuum.

If you're unconscious, is it really pain? Is it pain all the time, or just when it can be perceived?

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The short answer is blackbody radiation. Everything naturally glows a little bit, and that glow changes with its temperature. At "room temperature", it's in the infrared (Planck's Law). As temperature increases, so does that frequency of the radiation. If the tuning fork was heated to 500ish degrees Celsius, it would glow a dull red.

Global weather patterns would cause that water to mostly get carried away and end up raining back into the sea again. Even if you could prevent that, the volume of water you'd need to move to offset even a bit of sea level rise would be enormous.

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It is the natural frequency of the fork, so it will not waste (much) energy swinging at it.

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And yes, it makes a sound - You can press it against your skull to hear it (via Bone propagation)