10 Most Dangerous Things Discovered in Space

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– Hey there, how are ya? You’re lookin’ out of this world. Space is filled with an
unimaginably large number of things; things that benefit us,
like sunshine from the sun, and gravity, which keeps us in orbit and basically prevents us from (whistles) flying into the abyss. But there are plenty more
things that have been found in space that are very
dangerous to human life, things that are real
threats that, should we ever come across them, would
be a big problem for us. – [Astronaut] Okay,
we’ve had a problem here. – Here are the 10 Most
Dangerous Things Found in Space. Number 10 are comets. Comets continually orbit
around star systems, but these naturally-occurring
propelled masses of ice and rock are very dangerous. From studying comets
in our own star system, we know that they are icy bodies which, when warmed by the rays of our sun, release gas and dust, creating
a huge tail behind them. This jet-like process
propels these objects around the solar system,
but because comets propel themselves while
being pulled around by the gravitational
forces of the solar system, their orbits are eccentric and
not always easily calculated. There are well over 5,000
comets in our solar system with thousands more potentially out there just flying around. Some of these comets have nuclei measuring up to 100 kilometers. Literally, if one of
these ever hit our planet, the energy released would
wipe out, um, all of us. There’s something to think about while you go to bed tonight. Number nine are asteroids. Asteroids are rocky
objects which orbit a star. And like comets, they
can crash into planets, causing devastation. For the most part, asteroids
tend to be fragments of rock formed during the early
stages of a star system. Otherwise, they can be
the debris left over from large collisions
involving planets or moons, or even the remnants of a larger rock body torn apart by gravitational forces. In some rare cases, they
may have even originated from other star systems and
were fired into our solar system during a supernova or
other high-energy event. Through gravitational attraction, asteroids can be put on a
crash course with a planet. Oh, by Matt, that would never happen. That’s only in the movies. Actually, it’s happened to Earth before. And scientists believe that there are so many asteroids out there,
it’s not a matter of if but a matter of when this happens again. Where’s Bruce Willis when you need him? Number eight are coronal ejections. Coronal objections from
stars have the potential to cripple technology and even burn off parts of the planet’s atmosphere. In case you didn’t know, we need that. While they’re actually very common, these ejections just need
to be the correct strength and trajectory to cause mayhem for anything caught in their path. It’s assumed that, just like our own sun, all stars produce such events, and so this would be a hazard to ever star system in the universe. Coronal ejections usually
occur during a sun flare, which is a sudden
increase in energy output on the surface of a star. Though some flares do not
result in coronal ejections, when they do the star spews out hot, radiated clouds of plasm. When this shockwave of
plasma reaches a planet, it can cause geomagnetic storms which tears electrons
from electronic devices and may even expose any present
life to cosmic radiation. And I know the comics
make that sound cool, like you’re gonna turn into
Bruce Banner, the Hulk, but that’s most likely not gonna happen. You’re more likely just gonna have hands growing out your face. Number seven are interstellar planets. We commonly think of planets as masses of rock or gas which orbit a star. But there are planets
out there without a home, and if one of them wandered
into a star system, it could be disastrous. Hey, just a planet looking for a home. Oh, what is that, Earth? I’m comin’ for ya. These interstellar
planets spin through space without orbiting a star. It’s believed this occurs when a planet either flung out of a planetary system by gravitational forces or when a planet forms from debris outside
of a stellar region. Some of these planets
may even be failed stars which didn’t reach enough mass to ignite. It’s possible that an interstellar planet could pass close enough to a star system to be pulled into it. For example, if a new planet were suddenly mushed into our star system, basically there would just be
constant planetary collisions. And it’s not Like there’s
just a few of them. It’s estimated that there are billions of these worlds out there as we speak, wandering alone through the cosmos. Yeah, that’s not good. Do interstellar restraining orders exist? Number six are high-velocity stars. High-velocity stars are
some of the most dangerous objects in the universe. They move faster than the stars
in their local neighborhood, and so they have potential to collide with other star systems. Like an interstellar game of bumper cars, except everyone dies. There are three types
of high-velocity stars. These are runaway stars, halo stars, and hyper-velocity stars. Of these three, it’s hyper-velocity stars which are the most dangerous. And also have the coolest name. These stars can have
velocities which are so high that they can escape
the gravitational pull of an entire galaxy. Interestingly, no one is
quite sure how they even form, although some theories suggest that each hyper-velocity
star previously orbited a second star, which then
exploded and accelerated the surviving star to hyper-velocity. If a hyper-velocity star
entered our star system, it could pull planets
into its fiery embrace. (laughing maniacally) It’s so romantic. Number five is a supernova. A supernova is a devastatingly
dangerous space explosion. They occur at the end of
a massive star’s lifespan, when a titanic explosion takes place, creating a light source
which can easily outshine most of the stars around it. These events have been recorded
in the night sky many times, especially with Kepler’s
Supernova in 1604, visible to the naked eye even though it was
20,000 light years away. When the explosion occurs, the dying star expels much of its matter
at 10% the speed of light. This gigantic shockwave has the potential to destroy basically anything in its path. Hey everybody, get ready to die. You better watch out. Now, while these events are rare, some people believe that
dim white dwarf stars could explode in this way, which could happen suddenly
with almost no warning. But luckily, no such candidates have been found close to Earth, yet. So, just saying, you might
want to cross your fingers that our interstellar
neighborhood is a safe one. Number four are rogue black holes. Black holes are among the
most fascinating objects in the cosmos. But one theory suggests
that their destructive power could be waiting just around the corner. Hey, hey there. I’m a black hole. I’m destructive. Known as rogue black holes,
these gigantic objects are capable of strolling
into a star system and swallowing it up. Basically like an all you
can eat planet buffet. They’re produced when a
star collapses in on itself, creating a point in space
where gravity is so strong, even light can’t escape from it. What’s worse is that they
can’t be observed directly, and we can only detect them when we see their gravitational influence. While a supermassive
black hole can be spotted moving around a distant galaxy, there actually is one that
is much closer to home. Known only as the Bullet,
this probable rogue black hole is moving against the rotation
of our Milky Way galaxy and could destroy any
system it encounters. Oh, don’t worry, if you
haven’t lost sleep yet based on our impending doom,
we got three more to go. Number three are gamma rays. Gamma ray bursts are one of
the most energetic explosions in the entire universe. If one of them hit Earth,
the consequences would be … What’s the word? Deadly. They’re caused by a rapidly
rotating, high-mass star collapsing in on itself. This creates a neutron star,
quirk star or black hole and releases a beam of
radiation in the process. These bursts contain more
energy in just a few seconds than our sun will release
across its estimated 10-billion-year-long life. If one of these bursts
is directed at Earth, it would deplete our ozone and expose us to harmful cosmic radiation. Now, the good news is is
that scientists believe that it is unlikely than an
event like this will happen. But some also believe
that a gamma ray burst was responsible for the
Ordovician extinction around 455 million years ago. In case you don’t know what that is, that event wiped out nearly
85% of marine species. So that’s bad news for fishermen. Number two is galactic cannibalism. No, this isn’t aliens eating themselves. Let me explain. Galactic cannibalism is
one of the most dangerous and terrifying events
in the known universe. Galaxies contain billions
of stars and planets, and some may even have
supermassive black holes at their center. This creates an immense
amount of gravitational pull. When the gravitational
attraction of two galaxies takes effect, a collision
occurs which rips entire stars and planetary systems out of their orbit. Usually the larger galaxy absorbs either a section of, or
the entire smaller galaxy. And scientists predict that
this is going to happen in the next five years. (laughing maniacally) No, no, I’m joking, I’m joking. It’s going to take four billions years, when our galaxy will collide
with the Andromeda galaxy, with a 12% chance that
our entire solar system would be ejected from
the newly-formed galaxy out to wherever. Good thing that by then
Earth won’t even be habitable due to our sun expanding. Every cloud has a silver lining, I guess? And number one is the Big Rip. Most cosmologists agree
that the universe began with a gigantic explosion
known as the Big Bang, but some believe that this
event will inevitably lead to the end of the universe itself, known as the Big Rip. This theory states that the
universe will eventually literally tear itself apart. The idea is that, following the Big Bang, the universe began expanding. This expansion is still accelerating due to an elusive force
known as dark energy. Those who support the Big Rip hypothesis believe that this
expansion will eventually stretch the universe to an infinite point, causing everything from galaxies to stars, even subatomic particles themselves to suddenly tear apart. But hopefully this doesn’t
happen for a very long time. A, because I want to live. And B, I’ve got a lot
of errands to do today. It’s just big list. So those were the 10 most
dangerous things found in space. And if you guys enjoyed
this or learned something, be sure to give it a thumbs up. Also, be sure to subscribe to
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next one, goodbye now!

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