Space and time are two really complicated, but yet very interesting things to learn about. The more we know about it, the more interesting both these become.
Here are a few of our scientists’ findings about these really complicated things of our universe. I assure you, unless you’re a god damn physicist your mind will be BLOWN!
1. Speed of light – the law of universe!
First of all, consider you’re going in a car(A) on 10mph, now lets say you see another car(B) moving with 20 mph. You will feel like the car B is moving with the speed of 10 mph because you’re seeing it relative to your speed.
Now If a man stands at some point and sees the car B, he will feel like it is moving with the speed of 20 mph. right?
Now say I’m running away from you at 5mph and you’re standing still. A photon (light particle) runs between us; WE BOTH SEE IT MOVING AT THE SAME SPEED! Amazing right?
2. Time dilation – In other words time travel, but only forward
Speed is distance over time. So from the above explanation, we both see the light traveling in the same speed no matter of our speed right? You saw the photon move some distance X, I saw it move some distance that was more than X.
But we saw it move at the same speed! How is that possible? If and only if a clock in my pocket was ticking slower than a clock in your pocket! And that’s time dilation.
Time dilation explains why two working clocks will report different times after different accelerations. ISS astronauts return from missions having aged slightly less than they would have been if they had remained on Earth.
So let’s say you travel at 50% the speed of light for some time and then return to earth, almost everyone you know would either be aged or dead by the time you reach back to earth. And you won’t even see a thing different about your body.
3. Gamma ray bursts
If there is a gamma ray burst in our own galaxy and the burst is pointed at earth, we are toast. The people on the side of the earth facing the GRB can expect pretty quick death. You don’t know even know you’re dying, it’s that fast.
The people on the other side of earth will also die, bit, they will get some more time, enough time to know that they are dying.
Gamma ray burst is a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole.
4. Blackholes – powerful enough to control rotation of a galaxy from the center point
Blackholes are one of the most mysterious yet powerful entities in this whole world. Some of them are so powerful that it controls the rotation of their parent galaxy.
A black hole is a region of spacetime from which gravity prevents anything, including light, from escaping. the reason for there is no escape from a blackhole is because the escape velocity of a black hole is greater than the speed of light.
And nothing can be faster than the light.
5. The end of universe
Have you ever wondered how it all will end? The scientists have and there are a lot of theories about how it is going to end. Here is the one I liked! 😛
After around 100 trillion years after the big bang happened the universe will still be expanding and most of the mass that we can currently see in the universe is locked up in degenerate stars, those that have blown up and collapsed into black holes and neutron stars, or have withered into white dwarfs.
All the generated energy will be from proton decay and particle annihilation. Now this will continue for a very long time and at this point the life from the universe will be long gone.
1038 to 10100 years after big bang, Black Hole Era will begin. This is when almost everything turns/absorbs into a blackhole.
The only stellar-like objects remaining will be black holes of widely disparate masses, which are actively evaporating during this era. 10100 years into the future, the dark era begins.
All the blackholes will already be evaporated and mostly photons of colossal wavelength, neutrinos, electrons, and positrons will exist. And this my friend is the universe lies in its own ruins.