How do you solve the grandfather paradox?
The first solution to this famous paradox is that when you go back in time to kill your grandfather, you're not going back to your own history, but a copy of your history, and everything you do in this version of your history will affect the alternate future of that universe, not your own.
Who created the grandfather paradox?
In 1943, Barjavel asked what would happen if a man went back in time to a date before his parents were born and killed his own grandfather. With no grandfather, one of the man's parents would never have been born, and therefore, the man, himself, would never have existed.
Is backwards time travel possible?
As for backward time travel, it is possible to find solutions in general relativity that allow for it, such as a rotating black hole. Traveling to an arbitrary point in spacetime has very limited support in theoretical physics, and is usually connected only with quantum mechanics or wormholes.
Can humans travel through time?
Although humans can't hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth. We all travel in time! ... However, when we think of the phrase "time travel," we are usually thinking of traveling faster than 1 second per second.
Can a black hole die?
When particles escape, the black hole loses a small amount of its energy and therefore some of its mass (mass and energy are related by Einstein's equation E = mc2). Consequently, an evaporating black hole will have a finite lifespan.
Are white holes real in space?
Though mathematical solutions to those equations exist for white holes, “they're not realistic,” says Andrew Hamilton , an astrophysicist at the University of Colorado at Boulder. That is because they describe universes that contain only black holes, white holes and wormholes—no matter, radiation or energy.
What's the opposite of a black hole?
Is there a black hole at the center of every galaxy?
Almost every galaxy, including our Milky Way, has a supermassive black hole at its heart, with masses of millions to billions of times the mass of the Sun. Astronomers are still studying why the heart of galaxies often hosts a supermassive black hole.
Can you see a black hole?
You can 'see' the closest known black hole to Earth with the naked eye. There is a black hole in our backyard. Astronomers have found the closest black hole yet at just 1000 light years from Earth, close enough to see the stars that orbit it without a telescope.
What is behind a black hole?
Ever since Albert Einstein's general theory of relativity was considered to have predicted black holes by linking space-time with the action of gravity, it has been known that black holes result from the death of a massive star leaving behind a small, dense remnant core.
How did Einstein predict black holes?
Einstein denied several times that black holes could form. In 1939 he published a paper that argues that a star collapsing would spin faster and faster, spinning at the speed of light with infinite energy well before the point where it is about to collapse into a Schwarzchild singularity, or black hole.
Does time exist inside a black hole?
Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. ... Inside the black hole, the flow of time itself draws falling objects into the center of the black hole. No force in the universe can stop this fall, any more than we can stop the flow of time.
Who first theorized the existence of a black hole?
What happens to matter inside a black hole?
When matter falls into or comes closer than the event horizon of a black hole, it becomes isolated from the rest of space-time. ... Once inside the black hole's event horizon, matter will be torn apart into its smallest subatomic components and eventually be squeezed into the singularity.
Do astronauts shower?
On the ISS, astronauts do not shower but rather use liquid soap, water, and rinseless shampoo. They squeeze liquid soap and water from pouches onto their skin. Then they use rinseless soap with a little water to clean their hair. ... (See this video of astronaut Karen Nyberg washing her hair in space.)
What is the smell of sperm?
Semen normally smells like ammonia, bleach, or chlorine. Semen is about 1 percent sperm and 99 percent other compounds, enzymes, proteins, and minerals. Many of these substances are alkaline. This means that they're above a 7 on the pH scale, which is measured from 0 (highly acidic) to 14 (highly alkaline).
What does the moon smell like?
Apollo astronauts reported that lunar dust found inside their landers smelt like burnt gunpowder.
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