A Sound So Loud That It Circled the Earth Four Times (2014)
nautil.us
nautil.us
https://www.skyandtelescope.com/press-releases/astronomical-...
It’s currently still used to detect (above ground) nuclear explosions as part of the Comprehensive Nuclear Test Ban Treaty (CTBT).
There is a site in the ‘Windless Blight’ in Antarctica near McMurdo Station that a couple of techs go dig out and maintain every year. I believe there are about 30 around the world.
https://www.ctbto.org/verification-regime/monitoring-technol...
"Anak" = Children/Child of
The Death Toll has reached 373 people, 1.459 wounded and 128 still missing https://www.bnpb.go.id/en/tim-sar-gabungan-terus-menemukan-k...
Is that real? Doesn’t seem like it would matter enough. Especially when there was an eruption, why even mention it.
Here's a link to one of the videos with an energy plot from the Chile event - https://nctr.pmel.noaa.gov/chile20100227/20100227Chile.mov
And the specific Chile event page - https://nctr.pmel.noaa.gov/chile20100227/weblink.html
If you browse around the site, there is a lot of information for many of the largest earthquake/tsunami events in recent times.
https://www.youtube.com/playlist?list=PLd18vQxXt2zNmVDB2NQxV...
Most types of energy gradually turn into heat, including light, macroscopic kinetic energy, released gravitational potential energy, etc.
If you catch a baseball, the kinetic energy of the baseball turns into heat within your muscles (and skin, in the form of friction between the ball and your hands). If you walk down stairs, the gravitational potential energy that you're releasing turns into heat as well, as friction in your joints. Light shining on your skin turns into heat and warms it, as on a bright and sunny day. The electrical energy of a computer converts largely into heat, hence the need for cooling.
There are also theories that all matter may eventually decay, including all atoms and eventually even protons after 10^34 years (though proton decay has not yet been experimentally observed). https://en.wikipedia.org/wiki/Proton_decay
As someone on Quora wrote, "Heat is energy's final grave". The concept of "heat death of the universe" derives from the idea that, eventually, most forms of energy will decay into heat.
But my question is: Is that true? Why?
We also cannot measure stuff outside of the observable universe. Yet we do not say nothing exists beyond the observable universe.
To find out if something beyond the observable universe exists, you simply wait for the light to reach you. Every minute your observable universe grows larger and you see more stuff, the obvious conclusion is that there is more stuff.
But the random movements of air molecules allow for no analysis that there is a quantum of a sound traveling through it. It cannot be reasonably proven that the sound still exists. You can't wait to see if you notice more random sounds or anything, it's gone, part of the background noise. The information in the sound has been destroyed for any way to measure it via the movements of air molecules.
The universe is expanding. The further away something is from us, the faster it is moving away from us.
The part outside of the observable universe is so far away, that it is moving away from us at a speed faster then light. So we will never know anything about it.
Let's take the information 'The universe exists'. How can that information get lost? Wouldn't the universe have to disappear for that to happen? I have never heard about a model of reality where that is a possibility.
From a practical perspective, yes; but I get the feeling you're not asking that ;).
Let's say that we know everything possible about the universe at a time t (in some reference frame). Can I reconstruct what happened at any time in the past? If I can, then it seems reasonable to say that 'no information has been lost' (going the other way suggests that no information gets created either).
A lot of Physicists seem to think the answer is yes, we can construct the past if we actually knew everything. The evolution of the wavefunction is unitary, so you should be able to run the universe backwards to find out what happened (unless wavefunction collapse is real, in which case, we're losing information all the time). Note that in order to do this, you need to know the entire wave function; which isn't measurable.
However, under our current understanding of black holes, the answer seems to be "Looks like it?"
https://en.wikipedia.org/wiki/Black_hole_information_paradox
Since we don't know how to resolve General Relativity with Quantum Mechanics, we can't really say with confidence whether the universe can 'be played backwards' or not.
> The British ship Norham Castle was 40 miles from Krakatoa at the time of the explosion. The ship’s captain wrote in his log, “So violent are the explosions that the ear-drums of over half my crew have been shattered. My last thoughts are with my dear wife. I am convinced that the Day of Judgement has come.”