dinosaur

The word “dinosaur” conjures up images of gargantuan, now-extinct beasts that ruled the Earth long ago, holding a reign of horror for about one hundred sixty million years, and then mysteriously vanishing with only their bones as evidence of their existence. "Dinosaur" reaches deep into our minds and drags out nightmares from monster myths. What is the truth about dinosaurs that underlies the awe that covers them? What does modern science have to say about …showed first 75 words of 952 total…

…showed last 75 words of 952 total…A spectacular example of this was witnessed in 1994, when Jupiter was struck by a series of cometary fragments. Some of these impact blasts were larger than the Earth's diameter. Other factors such as extensive release of volcanic gases, climatic cooling (with related changes in ocean currents and weather patterns), sea-level change, low reproduction rates, poison gases from a comet, or changes in the Earth's orbit or magnetic field may have contributed to this extinction event.