The impact of an extraterrestrial object
, such as the one purported to have plagued these Alaskan mammoths, could have rendered much of northern Alaska inhospitable for decades, if not longer, says Firestone.
Evidence unearthed at more than two dozen sites across North America suggests that an extraterrestrial object
exploded in Earth's atmosphere above Canada about 12,900 years ago, just as the climate was warming at the end of the last ice age.
The scientists now report that at a depth of 766 m, a borehole pierced a beach ball-size rock that boars the chemical signature of an extraterrestrial object
Some mass extinctions, such as the disappearance of the dinosaurs 65 million years ago, have been pinned on the impact of an extraterrestrial object
The extraterrestrial object
that gouged out northeastern Arizona's Meteor Crater about 50,000 years ago struck Earth at a speed much slower than most scientists had previously proposed.
Scientists sifting through ancient sediments laid down just after Earth's most devastating episode of extinctions may have found minuscule fragments of the massive extraterrestrial object
suspected to have caused the catastrophe.
47 billion years ago contain remnants of what may have been an extraterrestrial object
large enough to disperse collision debris over the entire planet (162: 115).
The extraterrestrial object
suspected to have splashed down near Mexico's Yucatan peninsula more than 65 million years ago did more than just blast a big hole, cause worldwide climate change, and wipe out the dinosaurs.
Geologists have amassed considerable evidence that an extraterrestrial object
the size of Mount Everest slammed into the Yucatan region at the close of the Cretaceous period.
Impactites are thought to be products of the impact of large extraterrestrial objects
against the earth.
What is the likelihood of sizeable extraterrestrial objects
colliding with Earth?
And evidence of long-ago collisions between Earth and immense extraterrestrial objects
, as well as the spectacular impact of the disintegrating remnants of the Shoemaker-Levy 9 comet with Jupiter, demonstrated that the universe, far from being a serene, unchanging realm, as observers had once believed, could transform in an instant.
But extraterrestrial objects
are not the only causes for concern.
Compatible with both Windows and Macintosh operating systems, the most recent version of TheSky includes a galaxy of special features: tens of thousands of pictures of extraterrestrial objects
, a connect-the-dots constellation tool, and the ability to remotely control compatible telescopes.
Researchers say the meteor shower will provide a unique opportunity to collect information about the makeup of comets, the potential for damage to orbiting satellites from meteors, and the chemistry between extraterrestrial objects
and the Earth's atmosphere, which could provide clues on how life emerged.