Did the solar system ‘bounce’ finish the dinosaurs?

Every 35 to 40 million years our solar system goes through the dense part of the galaxy. It increases the chance of collisions with comets, asteroids, etc, that might have caused mass extinctions in our world in the past, like the extinction of dinosaurs around 65 million years back though there are other conflicting theories abound. Life also gets dispersed when comets bombard earths, as microorganisms take ride in resulting debris across the universe.

Here is an extract from an article from Cardiff University News Center that discusses a computer model of our solar system's movement built by scientists at Cardiff University:
"we pass through the galactic plane every 35 to 40 million years, increasing the chances of a comet collision tenfold. Evidence from craters on Earth also suggests we suffer more collisions approximately 36 million years. Professor William Napier, of the Cardiff Centre for Astrobiology, said: “It’s a beautiful match between what we see on the ground and what is expected from the galactic record.”

The periods of comet bombardment also coincide with mass extinctions, such as that of the dinosaurs 65 million years ago. Our present position in the galaxy suggests we are now very close to another such period.

While the “bounce” effect may have been bad news for dinosaurs, it may also have helped life to spread. The scientists suggest the impact may have thrown debris containing micro-organisms out into space and across the universe."