posted on Aug, 14 2007 @ 08:33 PM
There is some bias to the data. It starts 250 million years ago, at the beginning of the Permian/Cretaceous extinction and includes several minor
extinctions. It also appears to have lumped a few events.
A much better graph is given on Wikpedia:
...and there isn't a star called "Nemesis" that shows up on a regular basis. Stars (even brown dwarfs) shine rather brightly and we'd have seen
the thing in our sky, even without the help of telescopes since it would be part of our solar system. It would outshine Jupiter and even outshine
Sirius and the other bright stars of the sky.