What happened to the Dinosaurs?

Meteors / Mass flood would be the best guess.

A comet or asteroid is one idea, or a super volcano. There is also the idea that all the herbivoures ate all their food supply and starved, with them gone all the carnivoures ate each other. Also the big time ice age is another theory and it is not a case of them being cold blooded, because a lot of academics are unsure of that lately, but because they were so big their hearts could not handle the strain the cold put on their large bodies.
Of course it could be a combination of all of the above: Asteroid/comet hits, mass iceage ensues, much plantlife dies off from lack of sun and too much cold, which also causes heart attacks in dinosaurs and many starve, with the rest turning on each other until the last carnivoure had no animals of accomodating size to sustain it. Mammals were too small and too hard to catch so they were not going to be any kind of solution.

The chances of a comet or an asteroid hitting Earth are fairly astronomical. Between Mars and Jupiter there is a huge asteroid belt, hundreds of thousands, maybe millions of asteroids. You would think that increases our chances of being hit by one but that the belt, like a planet, has a gravitational well. This gravitational well draws back to it any stray asteroids, say if two big ones collide in the belt, one may be sent toward Earth but the gravitation of the belt is so strong, it will most likely be drawn back.
There are relatively few comets, as compared to the ammount of asteroids, zipping around our system, most do not and never will approach the sun anywhere near Earths orbit, but occasionally astronomers take interest in one, but they have thus far been way off.
I’d say the biggest threat would be if a comet slams into the asteroid belt, or one big mother of an asteroid, and the trajectory of the comet being inward towards the sun, the two massive objects may shatter into many, many smaller pieces, yet many of those pieces would still be large enough, and moving at a high enough velosity, to cause some major damage to Earthif one piece were to hit us. With many more pieces heading this direction, our chances of catching just one are more of a worry than any lone comet or lone asteroid hitting.
And that is probably what happened to the dinosaurs.

@cooper2023, Yes, I heard about that, I seen a doco on it, that no doubt could have been it. But there is no way it could have been a direct hit by a full comet, as I just explained is much more likely, simply because the size and speed of your typical comet would have been an Earth destroyer, there wouldn’t even be life now, there wouldn’t be much of a planet to speak of. So a shattered piece of comet is my bet.

@danfontaine, You see what I did there?

@theskafish, yes I have indeedy. What is interesting about that episode is that it show you can tell if any two life forms, no matter how different they may be, you can tell if they came from the same planet by examining their genetics, dna and stuff. There are markers that a human has in common with a slug that can tell a geneticist that we are from the same planet. That is some awesome shit, that episode. I was even thinking of bringing it up, cheers.