Asteroids vs. comets: NASA expert assesses the cosmic threats to Earth - Cosmic Log
"Ironically, the easiest ones to reach and mine are also those that are most likely to one day collide with Earth and perhaps disrupt or destroy our fragile civilization. If you're musing over the same question, here's an extra bit of data from Yeomans' book: A comet streaking in from the outer solar system would typically have three times the impact velocity of a similarly sized Earth asteroid hitting Earth
Your odds of getting killed by an asteroid just went way up - Vox
Even so, the event caused more than 1,500 people to be hospitalized with injuries, mostly from broken glass caused by a shock wave generated when the asteroid entered the atmosphere. When the Chelyabinsk asteroid landed, a few lucky breaks prevented any deaths: it was already fractured before entering the atmosphere (which made it break into smaller pieces and burn up more easily on the way down) and the largest of the pieces that did land went straight into a frozen lake
It could do the following things: Block a lot of sunlight, Disrupt the food chain from the bottom, Cause mass extinctions all at once, Cause tsunamis and environmental disasters, and Leave a thin-layer deposit of minerals not necessarily found on Earth. Other options include inviting a major speaker to the congregation sometime during the year and possibly a weekend retreat devoted to environmental issues
Asteroids: Pictures, Videos, Breaking News
David Wilkie Director of Conservation Measures, Wildlife Conservation Society Life on the Billionth Rock From the Sun I've always regarded asteroids as somewhat like dinosaurs: mildly interesting and faintly dangerous. Mark Boslough Physicist; Fellow of the Committee for Skeptical Inquiry Why Aren't We Preparing for Supervolcanoes? It isn't statistically probable that we will encounter a supervolcanic eruption within the next century (or even millennia)
In The World's 'Sixth Extinction,' Are Humans The Asteroid? : NPR
And were frogs among the first of the amphibians to really be noticed as dying off? KOLBERT: Yes, absolutely, what's become known as the amphibian crisis first came to the notice of scientists when people went out in places that they had always found, you know, huge numbers of frogs and toads, who are, you know, related, and just couldn't find them, just literally could not find them, places where - you know, in for example in the Sierras, one scientist told me that he went to a place where in his own youth, in his own graduate student days, you could go up there, and you couldn't avoid these frogs. One thing that happens when you move something around is it probably may not have any natural predators, so the brown tree snake had no natural predators in Guam, and Guam itself lacked any animal, and its only snake was this, you know, tiny, little wormlike thing
Death by meteorite - Bad Astronomy : Bad Astronomy
Consider that the threshold for global risk are objects around 1 km in diameter and that something around that size is likely to cause the death of about half the humans on the planet. one needs a 40km asteroid to break down SOME of the buildings there, and one would need a massive, 50km asteroid to throw someone at temrinal velocity, never mind the 100km-wide asteroid it would take to MAYBE kill someone in a trench sitting in the middle of the great plains
Dinosaurs : Discovery News
DNews: Stegosaurus Wasn't Above Striking a Low Blow Nov 6, 2014 12:00 PM ET Judging from injuries evident in allosaurus fossils, a paleontologist has deduced that stegosaurus knew how to use it spikes to deliver devastating crotch shots to the otherwise dominating allosaurs
BBC News - Dinosaur extinction link to crater confirmed
The extinction wiped out more than half of all species on the planet, including the dinosaurs, bird-like pterosaurs and large marine reptiles, clearing the way for mammals to become the dominant species on Earth. Furthermore, computer models and observational data suggest the release of gases such as sulphur into the atmosphere after each volcanic eruption in the Deccan Traps would have had a short-lived effect on the planet
Armageddon (1998) - IMDb
Then, NASA discovered that there is an asteroid roughly the size of Texas heading towards the Earth, and when it does hit the Earth, the planet itself and all of its inhabitants will be obliterated, worse, the asteroid will hit the Earth in 18 days
He stresses that his proposal differs from an earlier hypothesis that the energy of the impact was focused around Earth to a spot directly opposite, or antipodal, to the impact, triggering the eruption of the Deccan Traps. Paul Renne, a professor in residence in the UC Berkeley Department of Earth and Planetary Science and director of the Berkeley Geochronology Center, re-dated the asteroid impact and mass extinction two years ago and found them essentially simultaneous, but also within approximately 100,000 years of the largest Deccan eruptions, referred to as the Wai subgroup flows, which produced about 70 percent of the lavas that now stretch across the Indian subcontinent from Mumbai to Kolkata
That may be because cooler climates changed the types of vegetation available to eat, says Michael Benton, a palaeontologist at the University of Bristol, UK. In a review in press with the Geological Society of America, Archibald compares several rock formations from near the end of the time of dinosaurs, in Canada and the United States
Dinosaur Extinction, Cretaceous-Tertiary Extinction Information, Prehistoric Facts -- National Geographic
Either scenario would have choked the skies with debris that starved the Earth of the sun's energy, throwing a wrench in photosynthesis and sending destruction up and down the food chain. Regardless of what caused the extinction, it marked the end of Tyrannosaurus rex's reign of terror and opened the door for mammals to rapidly diversify and evolve into newly opened niches
Did dinosaur-killing asteroid trigger largest lava flows on Earth? -- ScienceDaily
23 HEALTH With help from bystanders, cardiac arrest outcomes improving Planned Parenthood attacked in second video on fetal tissue use More evidence smoking raises risk of death from breast cancer Drugmaker Novartis blocked from selling Neupogen copycat until Sept 2 Heart device maker St. He stresses that his proposal differs from an earlier hypothesis that the energy of the impact was focused around Earth to a spot directly opposite, or antipodal, to the impact, triggering the eruption of the Deccan Traps
Berman What Happened in Brief According to abundant geological evidence, an asteroid roughly 10 km (6 miles) across hit Earth about 65 million years ago. Fundamentalists are defined as people who believe that the primary way of learning about nature should not be the scientific method, or compilation of evidence tested in different labs in different countries, but rather interpretation of ancient manuscripts, such as the Koran, the Old Testament of the Bible, the New Testament, or other ancient writings
What Killed the Dinosaurs?
We now know that an asteroid at least ten kilometres across slammed off the coast of Mexico 66 million years ago, releasing 2 million times more energy than the most powerful nuclear bomb ever detonated. I think it is the Siberian Traps (?) that are relevant to this issue as the Indian eruptions were caused by the sub-continent of India breaking apart from Africa and moving north to eventually collide with the Asian continent so again IIRC that was a long time before the extinction event regarding the dinosaurs
How the Dino-Killing Chicxulub Asteroid Impact Was Found
Some researchers have explored other possible culprits for the disaster, including other impact sites, such as the controversial Shiva crater in India, or even massive volcanic eruptions, such as those creating the Deccan Flats in India. The crash would have released as much energy as 100 trillion tons of TNT, or beyond a billion times the power of the atom bombs that destroyed Hiroshima and Nagasaki
No, Seriously, What Killed the Dinosaurs? : Discovery News
These epic floods of molten rock are thought to have spanned 200,000 square miles (the size of California, New Mexico, Arizona, And Colorado combines), and in some places they are close to two miles thick. But they're still suspiciously close together, suggesting that perhaps some great collision in the solar system sent a scatter-shot of space rocks headed our way
Timing of an impact New findings using high-precision radiometric dating analysis of debris kicked up by the impact now suggest the K-T event and the Chicxulub collision happened no more than 33,000 years apart. For instance, dramatic climate swings in the preceding million years, including long cold snaps in the general hothouse environment of the Cretaceous, probably brought many creatures to the brink of extinction
The theory also concluded that not only was the dinosaur extinction abrupt but may have actually only taken hours as the heat from the astroid was so intense that the atmosphere (which was oxygen rich, as mentioned in the article) literally caught on fire in a ring of death that that circled the globe. It takes Way more faith to believe the world is here by accidents that are mathematically impossible anyway, than to believe in the Biblical God! Many scientists are also Christians as well and see no conflicts with their faith
These observatories have identified and obtained orbital parameters for an estimated 90 percent of all asteroids in the solar system larger than 1 kilometer in diameter. An asteroid impact on land could cause vast forest fires such as the famous Tunguska event of 1908, when such an impact devastated 2,000 square kilometers of Siberian forest
End of the dinosaur age: A depiction of a Tyrannosaur as the asteroid strikes Before the cosmic explosion, many creatures were brought to the brink of extinction by dramatic climate swings in the preceding million years, including long cold snaps. The impact was clearly the final straw that pushed Earth past the tipping point.' The asteroid collision with Earth has now been dated to 66,038,000 years ago
Evolution: Extinction: What Killed the Dinosaurs?
For months, scientists conclude, dense clouds of dust blocked the sun's rays, darkening and chilling Earth to deadly levels for most plants and, in turn, many animals. Melted Rock These pieces of once-molten rock, called impact ejecta, are evidence of an explosion powerful enough to instantly melt bedrock and propel it more than a hundred miles from its origin
Asteroid killed off the dinosaurs, says international scientific panel -- ScienceDaily
The extinction wiped out more than half of all species on the planet, including the dinosaurs, bird-like pterosaurs and large marine reptiles, clearing the way for mammals to become the dominant species on Earth. Immediately after the iridium layer, there is a dramatic decline in fossil abundance and species, indicating that the KT extinction followed very soon after the asteroid hit
The asteroid, which had a diameter of about six miles struck the Yucatan peninsula and left a crater, now known as the Chicxulub, measuring 12 miles deep by 124 miles wide. The violent collision 66m years ago, which occurred in the area that is now Mexico, triggered tsunamis across the oceans, caused powerful earthquakes and released enough heat to start many fires
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