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Gamma ray bursts.
Google the Fermi Paradox. Equal parts scary and sad.
Edit: Here’s a link: http://waitbutwhy.com/2014/05/fermi-paradox.html
>An accurate clock at rest with respect to one observer may be measured to tick at a different rate when compared to a second observer’s own equally accurate clocks. This effect arises neither from technical aspects of the clocks nor from the fact that signals need time to propagate, but from the nature of spacetime itself.
This isn’t some crazy hypothesis. It’s a testable, and proven fact.
The fact that time itself is not constant for everyone and everything. That it is relative to me personally and my speed in the universe. This bothers and upsets me for some reason.
Just the mind boggling size freaks me out sometimes.
If black holes don’t scare you then nothing about the universe is going to
The sun, the earth, stars, planets, solar systems, galaxies, clusters and superclusters make up about 4-5% of the observable universe. The other 95% is both dark matter and dark energy, forces and substances that, as far as we know, are incomprehensible by our current laws of science.
That i’ll be dead by the time all the really cool things happen and can be observed.
Because of the expansion of the universe, there will be a time when all of the other stars and galaxies are so far away that the night sky will be empty.
Gamma ray bursts, “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.”
How intense is it? Well, “a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime.”
Pretty hardcore, right? But we detect them up pretty regularly, so why is it scary? Well, the GRB’s we detect are usually billions of lightyears away, not in our own galaxy. 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 radiation sickness and pretty quick death. The people on the opposite side of the earth can expect a major dose of radiation, but they will probably live long enough to realize the ozone layer has been stripped away and that everything on earth is going to die pretty soon.
And there’s no advance warning.
It might be just a simulation.
This creeped me out completely, especially the beyond section.
Edit: a more detailed description of how I reacted was: nearly shat my pants and said I love you to my family and issued a group hug, then proceeded to have a panic attack. Also just the fact that in 10^100 , even though this won’t effect me, the dark age of the universe will come, sends chills down my spine.
If you had a soda straw eight feet long, and you held it up and looked through it at night in a random direction, and your eyesight was strong enough, you would be able to see about 10,000 galaxies. Not stars, galaxies.
The scariest thing is, we have still have all of our eggs in one basket. Only Earth has plants and animals, and an environment to sustain us, and of course, US.
There are so many upcoming events to look forward to…
There are plenty of loose rocks and lumps of ice in the solar system that could find their way into a collision course with Earth. Our only home. No convenient way to stop them, at the moment. Not even a reliable way to detect and predict which ones will be a problem, later, in time to do something deliberate about it.
The sun’s luminosity is gradually, but steadily increasing. In less than one billion years, the Earth will be roasted, airless rock, like Mercury, long before the sun swells up and swallows it, in about 4~5 billion years. The natural climate will continue to get hotter, and degrade for this entire time.
If we haven’t escaped the solar system before the Earth becomes a sterile rock, we will die with it.
In about four billion years, the Andromeda and Milky Way galaxies will collide. Millions of years of shit being pulled out their orbits, and flung all over the place, including eventually ‘falling’ into the singularities of both galaxies. For anyone in either galaxy, this will suck, and it will suck for a very long time. If we’re still around, and haven’t escaped the Milky Way, we will be caught up in that mess.
Then there’s the Ultimate Fate of the Universe
There are several possibilities for everything to end. Some based on parameters that are unknowable. In fact, due to the speed of light limitation, something like the ‘big rip’ might have already happened, and we would have no way of knowing it, until it overtook us.
Unless we can figure out a way to sustain some form of space-time and causality its self, we will ultimately perish.
Let’s face it, the whole universe is out to kill us. Without a HUGE dose of enlightened self-interest, we will become extinct.
Black Holes. They literally gave me nightmares. I remember when I got my first science text book back in fourth grade and I when I was skimming through I came across our solar system. I became so obsessed with space from that point on that even today it’s my dream to go aboard the international space station and just float around. Anyway, so I’m finished reading about our solar system and I move on to the next page where it begin to talk about black holes, in great detail. For about two weeks after reading about them I would have nightmares about a black hole showing up undiscovered by NASA and proceeding to swallow the Earth.
TL;DR: Black Holes scare the hell outta me.
That the sun will burn out. That’ll be a tough day on planet earth