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[Arata]

Did you notice that there is a major asteroid impact every 70 million years or so?
Why is it like a schedule?What is out there causing this?

Meet Nemesis.

Nemesis is known to be a brown/red dwarf star that is known to be on the outskirts of our solar system, further that the Oort Cloud.
It's orbit is known to make it crash into the Oort cloud every million years or so, which knocks them out of the orbit and towards the solar system.
Most of these comets would then hit the earth, which is the reason of extinction.

If it's out there, then we have a second sun.

Source:
http://www.lbl.gov/Science-Articles/Archive/extinctions-nemesis.html

[Naru523]

I already post this in Off Topic.  

http://universesandbox.com/forum/index.php/topic,491.0.html

[SuperNova]

listen, this is all fiction. not real

[Naru523]

If it's out there, then we have a second sun.

[monmarfori]

Then a spacecraft can detect Nemesis easily by November 2009.

[Arata]

Who knows, they actually might find it!

[hbmp88]

I thought the reason for it was that our solar system passes through a layer of debris while orbiting the galactic center and we keep moving in and out of it

[Naru523]

Well lets just say that we're not even there yet!