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What If a needle or a grain of sand hits the earth at the speed of light?

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We are used to anticipating danger from outer space . A huge almost unknown space hostile to humans and no wonder colossal explosions take place asteroids and comets travel at tremendous speed . There are black holes and all this can potentially cause the death of the earth but what about something small for example an ordinary sewing needle what if one finds itself in space accelerates to the speed of light and then crashes into our planet .   Any object consisting of matter can't move at the speed of light or faster so scientists from NASA are unlikely to ever consider such a disaster well I will do it for them today you'll know how dangerous such small things can be if they are properly accelerated and at the same time, you'll learn about another strange scenario of the end of the world . Our planet is constantly bombarded by various cosmic bodies we don't even notice most of them they just burn up in the atmosphere .     Sometimes celestial b...

Would we ever be able to build a Time Machine?

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Well, Time Travel is just a  technical problem  now There are several ways we can travel in time (future), two of them are, 1. Orbiting a Black Hole -  Time slows down as we reach an object with high gravitational potential. So, we could orbit closer to a Black Hole, then for us time will run slower compared to the people on Earth. 2. High Velocity -  As per relativity, the faster we move slower the time gets. So, if we could build a spaceship that can reach speed closer to light, then we would be able to travel in time. As I said, right now time travel is a technical problem & our today's technology isn't advanced enough to build such spacecraft. However, some people are trying make this happen, for example,  Harold White  at NASA is trying to build an  Alcubierre Warp Drive .

How can space expand faster than the speed of light ?

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Albert Einstein published Theory of Special Relativity in 1905, about 10 years later he published General Theory of Relativity on 25 November 1915. Through relativity, Einstein made it very clear that nothing can travel faster than the speed of light. But according to the Big Bang Theory space expanded much faster than this speed when it was formed 13.8 Billion ago. Now you would be wondering when nothing can travel faster than the speed of light, then how come our space expansion took place so fast? The answer to this question is that  nothing can move faster than the speed of light  in  our universe , which means those laws & rules are bounded within the Universe. But the universe itself isn't in the universe, so space itself can travel faster than light, but nothing inside it can.

Are aliens real ?

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I think so aliens are real but there are 6 types of species found on our planet. One of them is animals and us but the other five are not yet known. We don't have that capability to see them. If you ever happen to read QURAN the Holy Book of Muslims, you could find that Allah has made Prophet (SAWW) Superior over all universes and all types of species. This hits a clue to our brains that aliens may be real. Our eye is blocked to see the other 5 types of species found on our own planet. I think so one of them includes ghosts also but who knows. We could only be able to find it after we are dead. - These are all my personal views only.

What lies behind a Black Hole ?

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Black Holes sucks nearly everything that comes in their path, but where does that matter go? Some scientists believe that Black Holes ends up as a White Hole. Once you enter a Black Holes you will come out from the other end in some other universes or far somewhere far away. But it's just a theoretical idea, no scientific proofs.

So if we can turn ourself into Photon using some kind of machine , Can we travel at the speed of light ?

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Light travels so  fast  because it has  no mass  but still some momentum. The particles that make up EM radiation are called photons where each and every photon has a packet or quantum of energy depending upon its frequency. So, yes. If you could turn yourself into a photon you will reach the speed of light as soon as you do it.

What would happen if Apophis Astriod hits Earth's surface ?

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Apophis was discovered by  Roy A. Tucker ,  David J. Tholen  &  Fabrizio Bernardi  on June 19, 2004. It is a 400 meters wide & 26.99 billion kg heavy asteroid with an average orbital speed of 30.728 km/s. Astronomers calculated that there's a small possibility of Apophis hitting Earth in 2029 or 2036. So, what will happen if Apophis hits the Earth? On hitting Earth it will produce an Energy of more than  100 thousand Hiroshima bombs , which is enough to destroy an entire country. In case it lands in highly populated areas or countries like India, China, or America then it will kill millions of people within a few minutes of destruction. Now you might be wondering how do we stop this Asteroid from hitting Earth? Well, today we don't have any good practical solution to stop an asteroid that big. But, here are a few ideas that might be helpful in the future. Laser Beam -  By pointing a strong laser beam on the asteroid we can actually change...

Is it possible to travel in Time ?

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Yes, it is!  Scientists have been trying to find out new ways to travel in time for decades. Earlier it seems impossible, but not anymore. According to scientists,  Time Travel  is now just a  technical problem  that we need to solve. Here are a few possible ways to travel  forward in time , Orbiting a Black Hole -  As per Theory of Relativity we know, time slows down as we get closer to an object with high gravitational potential. Black Holes are the objects with intense gravitational potential, so if we could go closer to a Black Hole in a space-ship & orbit around it, then for us time will run slowly as compared to the people on Earth. But the problem with this idea is that Black Hole's gravity is so intense that it bends the space-time fabric & if our spaceship will try to approach a Black Hole it will probably never return. High Speed -  The faster you move, the slower the clock gets. Albert Einstein explained it as  Time ...

List of things which can travel faster than the speed of light ?

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Albert Einstein said that nothing in the universe can travel faster than light. Einstein was right, but his ideas were not only limited within the universe but also science wasn't so advanced back then as it is today. Here's the list of 4 things which can travel faster than the speed of light, Big Bang -  Withing a millionth of a millionth of a millionth of a second Big Bang went from smaller than an atom to bigger than a galaxy. The explosion was so huge & vast that everything we see around us today was made within a blink of an eye. Therefore we can say that empty space can actually expand faster than light. Negative matter -  If we would be able to create & control the negative mater then we would be able to make wormholes. Wormholes are the tunnels through space which we can be used to travel across the galaxies within a fraction of a second. This means negative matter could be the key rapid space exploration & travel faster than light. Quantum Entangle...

If we move with the speed of light and hold a mirror in our hand with proper length. Will we be able to see ourself?

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At the moment you reach the speed of light, time for you will stop completely. This means you will freeze within one instance, as a result, you won't be able to see yourself. If you travel just below the speed of light, say 99.999% the speed of light, and hold a mirror in front of you, then you would be able to see yourself.

Theory of Relativity : Explanation

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The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.!Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity. General relativity explains the law of gravitation and its relation to other forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. With relativity, cosmology and astrophysics predicted...

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