thequantumlife:

Imagining the Tenth Dimension

This is an interesting video explaining how to think in 10 dimensions.

Mind blowing.

Hello, freshman year of college.  It’s been quite some time, hasn’t it?

"The grandfather paradox is simply a way of pointing to the fact that if the familiar laws of classical relativistic physics are supposed to hold true in a chronology-violating space-time, then consistency constraints emerge."
— John Earman, Bangs, Crunches, Whimpers and Shrieks
"Physics tells us what is impossible, no matter what we spend. Engineering tells us what is possible, and how much it will cost."
— Walter F. Cuirle, Notebooks
Make your own Wormhole Time Machine

It’s easy- just follow these four simple steps.

  1. Build a small wormhole.  Both ends will be in the same point in time.
  2. Attach one end of the wormhole to something very heavy and the other to a spaceship that’s going at 90 percent of the speed of light.  Every spaceship year is equivalent to 2.3 years on Earth; clocks at either end of the wormhole will go at different speeds.
  3. Wait for a while.  After 46 years of Earth time, bring the wormhole to a friendly planet.  Traveling through the wormhole can take you from the year 2046 on Earth to the year 2020 on Zeelox or vice versa.
  4. If you were really smart, you could have started planning the mission far in advance.  You could have sent a message to Zeelox long before you started, arranging for a spaceship from Zeelox to do the reverse process, beginning in 1974 (Zeelox time).  Then in year 2020 (Zeelox time), the other wormhole could transport you to Earth in the year 1994 (Earth time).  If you use both wormholes, you can jump from 2046 (Earth time) to 2020 (Zeelox time) to 1994 (Earth time): you’ve traveled back in time more than half a century!

Source: Seife, Charles. Zero: the Biography of a Dangerous Idea. New York: Penguin, 2000.

There are pictures involved, but I can’t find a good scan of them online.

namdiez: cwnl: Life May Exist Within A Super Massive Black Hole Despite being considered the most destructive force in space and absolutely uninhabitable, the conditions for life exist inside supermassive black holes, a Russian cosmologist has theorised. Going out on a scientific limb somewhat, Vyacheslav Dokuchaev has even suggested that if life did exist inside the SBH, it would have evolved to become the most advanced civilisation in the galaxy. Supermassive black holes are such powerful gravitational forces that they suck in everything around them, including light, and nothing that crosses the black hole’s ‘event horizon’ is ever seen again. But now Dokuchaev, of Moscow’s Institute for Nuclear Research of the Russian Academy of Sciences, says existing evidence combined with new research throws up intriguing possibilities for certain types of black holes. Inside a charged, rotating black hole there are regions where photons can survive in stable periodic orbits. Dokuchaev specialises in studying those orbits and their dynamics. He speculates, in a paper published in Cornell University’s online journal arXiv, that if there are stable orbits for photons, there is no reason why there could not be stable orbits for larger objects, such as planets. The problem is that these stable orbits would only exist once you have crossed the threshold of the event horizon, where time and space flow into one another. The event horizon, at the lip of the black hole, is known as the point of no return. However, beyond the event horizon is another domain, known as the Cauchy horizon, where time and space return to stable states. It is inside the Cauchy horizon that life could exist, Dokuchaev argues in a paper published in Cornell University’s online journal arXiv, However, the type of life that could exist in those conditions - where they would be subject to massive fluctuating tidal forces - would have evolved beyond ours. The life that could exist there would likely be a civilisation ranked as Type III on the Kardashev Scale. There are three levels to the scale with one being the lowest and three the highest. Humanity is still looking to attain Level 1 status; mastery of its own planet. ‘Interiors of the supermassive black holes may be inhabited by advanced civilisations… invisible from the outside,’ he says. Though that is a spine-tingling thought, Dokuchaev’s proposition can only ever remain theoretical. Because nothing can ever escape from a black hole due to its enormous gravitational pull, we will never know if it is true. I smell a good sci-fi plot… Also this is really interesting. I’m sorry, but this is really pushing the boundaries of what I can accept, scientifically. 

namdiez:

cwnl:

Life May Exist Within A Super Massive Black Hole

Despite being considered the most destructive force in space and absolutely uninhabitable, the conditions for life exist inside supermassive black holes, a Russian cosmologist has theorised.

Going out on a scientific limb somewhat, Vyacheslav Dokuchaev has even suggested that if life did exist inside the SBH, it would have evolved to become the most advanced civilisation in the galaxy. Supermassive black holes are such powerful gravitational forces that they suck in everything around them, including light, and nothing that crosses the black hole’s ‘event horizon’ is ever seen again.

But now Dokuchaev, of Moscow’s Institute for Nuclear Research of the Russian Academy of Sciences, says existing evidence combined with new research throws up intriguing possibilities for certain types of black holes. Inside a charged, rotating black hole there are regions where photons can survive in stable periodic orbits. Dokuchaev specialises in studying those orbits and their dynamics.

He speculates, in a paper published in Cornell University’s online journal arXiv, that if there are stable orbits for photons, there is no reason why there could not be stable orbits for larger objects, such as planets. The problem is that these stable orbits would only exist once you have crossed the threshold of the event horizon, where time and space flow into one another. The event horizon, at the lip of the black hole, is known as the point of no return. However, beyond the event horizon is another domain, known as the Cauchy horizon, where time and space return to stable states.

It is inside the Cauchy horizon that life could exist, Dokuchaev argues in a paper published in Cornell University’s online journal arXiv, However, the type of life that could exist in those conditions - where they would be subject to massive fluctuating tidal forces - would have evolved beyond ours. The life that could exist there would likely be a civilisation ranked as Type III on the Kardashev Scale. There are three levels to the scale with one being the lowest and three the highest. Humanity is still looking to attain Level 1 status; mastery of its own planet.

‘Interiors of the supermassive black holes may be inhabited by advanced civilisations… invisible from the outside,’ he says. Though that is a spine-tingling thought, Dokuchaev’s proposition can only ever remain theoretical. Because nothing can ever escape from a black hole due to its enormous gravitational pull, we will never know if it is true.

I smell a good sci-fi plot…

Also this is really interesting.

I’m sorry, but this is really pushing the boundaries of what I can accept, scientifically. 

raddlesnakes:

Carl Sagan saw that from an early age, the midichlorians were strong in this one.

(Source: virtualsky)

The Physics of Mass Effect

This is actually an appreciable analysis.

ichrider:

knowledgehoover:

Quantum Levitation by Tel Aviv University

Can I just say…

HOLY FREAKIN’ SHIT! THIS IS AMAZING. LITERALLY AMAZING. I AM SERIOUSLY NOT KIDDING, IT’S AMAZING.

(via trademark)

This is pretty damn sweet!

I wasn’t impressed until I saw it hold position at an angle not parallel with the surface.

"The most exciting phrase to hear in science, the one that heralds the most discoveries, is not “Eureka!,” but “That’s funny…"
— Isaac Asimov
This is what I got: The Doppler Effect (with a moving source and moving listener) is given by: fL=fS*(v + vL)/(v + vS) Where fL= frequency of sound wave observed by listener fS=frequency of sound wave emitted by source vL=the velocity of the listener vS=the velocity of the source v =the velocity of the sound wave (~340 m/s in air at sea level) Note that the sign convention for the listener’s and source’s velocities is positive only when the listener is moving towards the source. So we have: 1260 Hz= (1200 Hz)*(340 m/s - 9 m/s)/(340 m/s - vS) Solving for vS gives vS= 24.76 m/s From this, we can make two position equations as functions of time: sL(t)= 100m +(9 m/s)*t sS(t)= (24.76 m/s)*t Setting these two equations equal to each other and solving for t gives t= 6.35 seconds, so I’d be inclined to go with B as the answer.  Using 343.2 m/s as the speed of sound (courtesy of Wolfram Alpha) gives t= 6.28 seconds. Comparatively, the fastest record of a human completing the 100 meter dash is 9.58 seconds.  If a velociraptor could actually do it in under 7 seconds that would be fucking terrifying.

This is what I got:

The Doppler Effect (with a moving source and moving listener) is given by:

fL=fS*(v + vL)/(v + vS)

Where

  • fL= frequency of sound wave observed by listener
  • fS=frequency of sound wave emitted by source
  • vL=the velocity of the listener
  • vS=the velocity of the source
  • v =the velocity of the sound wave (~340 m/s in air at sea level)

Note that the sign convention for the listener’s and source’s velocities is positive only when the listener is moving towards the source.

So we have:

1260 Hz= (1200 Hz)*(340 m/s - 9 m/s)/(340 m/s - vS)

Solving for vS gives vS= 24.76 m/s

From this, we can make two position equations as functions of time:

sL(t)= 100m +(9 m/s)*t

sS(t)= (24.76 m/s)*t

Setting these two equations equal to each other and solving for t gives t= 6.35 seconds, so I’d be inclined to go with B as the answer.  Using 343.2 m/s as the speed of sound (courtesy of Wolfram Alpha) gives t= 6.28 seconds.

Comparatively, the fastest record of a human completing the 100 meter dash is 9.58 seconds.  If a velociraptor could actually do it in under 7 seconds that would be fucking terrifying.

(Source: )

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