a little LOL for those sick of the spam

ovrkyl

gradii

In Space, no one can hear you scream. But thanks to Science Fiction, EVERYONE can hear you explode.

gavinruneblade

gradii wrote: »

In Space, no one can hear you scream. But thanks to Science Fiction, EVERYONE can hear you explode.

Actually not true at all. Sound does in fact travel in space.
http://www.nasa.gov/centers/goddard/universe/black_hole_sound.html

You may be wondering how a sound wave can travel through space. After all, sound waves require some sort of stuff to move through. This stuff, called a medium, can be air, water, or even solid rock. And space is thought of as lacking any medium because it is a vacuum.

In fact, space is not a pure vacuum but rather it contains stray bits of stuff -- gas atoms and dust of varying amounts. In the case of the Perseus cluster, the gas throughout it serves as the medium through which the sound waves coming from the central black hole travel.

The sound waves were indirectly detected using the Chandra telescope because the cluster gas is very hot and thus emits an especially energetic form of light called X rays, as well as less energetic visible light. And the gas is so hot because of the effects of the black hole.

More than an acoustic curiosity, these sound waves transport energy that keeps gas throughout the cluster warmer than it would otherwise be. These warmer temperatures, in turn, regulate the rate of new star formation, and hence the evolution of galaxies and galaxy clusters. This makes the findings far more significant for understanding the astrophysical evolution of the Universe.

That said, to hear a scream the two of you would need to be very close.

gradii

I knew that, but it's not enough to really hear anything from any distance.

gavinruneblade

gradii wrote: »

I knew that, but it's not enough to really hear anything from any distance.

Actually, it is. But we hit the "practicaly vs technically" which mostly means anyone using "technically" is talking about something irrelevant or absurd.

The sounds of that black hole are directly audible (not just indirectly via x-rays like how we found them) throughout the whole cluster of galaxies. That is how the sound waves are shaping the distribution of matter over such distances per the actual research paper. The trick is that nothing living (that we know of) can hear in the ranges low enough to travel such distances. So "technically" it isn't distance its frequency that makes it inaudible. Practically, you're totally correct, its inaudible for all intents and purposes.

bernatk

In space no one can hear you meme...

cidjack

Thank you for making me laugh!!

I stopped reporting gold Spammers, I get more email from PWE about it, and it is always a canned message.

lagomorphic

gavinruneblade wrote: »

gradii wrote: »

In Space, no one can hear you scream. But thanks to Science Fiction, EVERYONE can hear you explode.

Actually not true at all. Sound does in fact travel in space.
http://www.nasa.gov/centers/goddard/universe/black_hole_sound.html

You may be wondering how a sound wave can travel through space. After all, sound waves require some sort of stuff to move through. This stuff, called a medium, can be air, water, or even solid rock. And space is thought of as lacking any medium because it is a vacuum.

In fact, space is not a pure vacuum but rather it contains stray bits of stuff -- gas atoms and dust of varying amounts. In the case of the Perseus cluster, the gas throughout it serves as the medium through which the sound waves coming from the central black hole travel.

The sound waves were indirectly detected using the Chandra telescope because the cluster gas is very hot and thus emits an especially energetic form of light called X rays, as well as less energetic visible light. And the gas is so hot because of the effects of the black hole.

More than an acoustic curiosity, these sound waves transport energy that keeps gas throughout the cluster warmer than it would otherwise be. These warmer temperatures, in turn, regulate the rate of new star formation, and hence the evolution of galaxies and galaxy clusters. This makes the findings far more significant for understanding the astrophysical evolution of the Universe.

That said, to hear a scream the two of you would need to be very close.

In a nebula we can totally hear you scream.

bumperthumper

gavinruneblade wrote: »

gradii wrote: »

In Space, no one can hear you scream. But thanks to Science Fiction, EVERYONE can hear you explode.

Actually not true at all. Sound does in fact travel in space.

Both are true, but how many humans have taken off their helmets in space to try testing it out for a real "world" application? I'm sure Apple will try some sort of mic in space some time soon for publicity, though. Ugh, I hate that company.

To the OP: AWESOME PNG.

mirrorchaos

you hate spam? but how can you hate spam?