Is Nemesis Star Responsible For Mass Extinction?

History indicates that on Earth there is a cycle, but not a cycle of life per se, but one of extinction. And some scientists think that there is a "Nemesis" out in space that is the cause. Join us as we explore what is this Nemesis and how it could affect the Earth.
8. The Cycle Of Extinction
If you were to look at the history of our planet from now all the way back to the earliest days of life itself, you will notice a pattern. Mainly one of extinction. Not of the whole planet obviously, but one that indicates that sometime every 27 million years or so there is a massive extinction event that ravages the planet. You likely already know of some of them, such as the meteor that crashed into the planet and the dinosaurs. Or maybe even The Great Oxygenation, where Earth went from having no Oxygen, to too much Oxygen thanks to bacteria, nearly keverything on the planet as a result.
No matter which one you think of, the fact remains, these events happen, and they continually happen every 27 million years. When a pattern like this occurs, it means it's not dumb luck or chance, right? It couldn't be because it's too perfect a lineup. But it also obviously can't be something that occurs just within the confines of Earth, right? Meaning that the planet can't be responsible for this all the time, right? Exactly.
So where does that leave us? If it's not random, and it's not something that is caused by the Earth, what is doing this? That would be space, or more accurately, it would be about a single entity in space that is said to influence the planet and the solar system in a way that makes it so that every 27 million years or so something bad happens to cause an extinction event. This is the theory of the Nemesis Star.
7. The Nemesis Star
So what exactly is a Nemesis Star? You know, outside of something that I'm sure has been the name of some at least one kind of space base or whatever in a sci-fi film. Well, to put it in simplistic terms, the Nemesis Star is the "twin" of our own sun. But while our sun does nothing to help the solar system (by keeping us in orbit around itself, giving us heat and light, etc.) the "Nemesis" star is one that is able to alter things in the solar system to cause mass extinction events on Earth. Such as the asteroid that came tol the dinosaurs:
"The Nemesis Theory is an outgrowth of the discovery that the impact of a large comet or asteroid may have been responsible for the great mass extinction," Douglas Vakoch, president of a nonprofit called Messaging Extraterrestrial Intelligence noted.
But what exactly is the star itself? It's a theory laid out by Richard Muller of the University of California Berkley back in 1984. He stated that somewhere near our solar system is a dwarf star that has such a mass and gravity that it's able to affect the outer reaches of the solar system and send things like asteroids in our direction.
"But is that really possible?" you might be asking, "Wouldn't it need to be really close to do that?" Why, yes it would, and Muller speculated that Nemesis was only 1.5 light years away from us, which means that not only could it affect us, it's possible that it goes right through the solar system without us knowing it.
"When Nemesis passes through the Oort cloud, the theory goes, it dislodges comets that in turn make their way to Earth, causing cataclysmic events," Vakoch said.
Which begs another question...
6. How Have We Not Seen Another Star So Close To Us?
Given that we look up into the night sky and see a whole bunch of stars, including ones that are many light years away, it may seem odd that there is a star that is somehow nearby, is able to influence our solar system, and yet we haven't seen it. Is such a thing really possible? Yes, yes it is, and it all boils down to the kind of star that Nemesis is rumored to be. Mainly, a white or brown dwarf star. Though to be clear there are others who think it's another kind of dwarf star but for this one just roll with it.
The reason for this being a big believe in the Nemesis Theory is that both of these stars would be only able to cast a certain type of light. In this case, a rather dim one. The reason we see the stars at night is because they burn brightly in the vacuum of space and they are able to travel far. But, if you don't emit much light at all, you likely wouldn't be able to see it the more distance you travel. Like a flashlight in an open field. You see a house in the distances and you point it at it, but its light doesn't shine on the house. It's that kind of thing.
So given that, and given that we couldn't see it, it's possible that such a star exists just outside our solar system, yet is able to influence it.

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