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If you've seen films like "Armageddon," you know the potential threat asteroids can be for Earth. To meet that threat, NASA has built a map like no other: a plot of every dangerous asteroid that could potentially endanger our planet … at least the ones we know about.
NASA released the new map of "potentially hazardous asteroids" on Aug. 2 in a post to its online Planetary Photojournal overseen by the agency's Jet Propulsion Laboratory in Pasadena, Calif. The map shows the orbital paths of more than 1,400 asteroids known creep too close to Earth for comfort. None of the asteroids mapped pose an impact threat to Earth within the next 100 years, agency officials said.
"These are the asteroids considered hazardous because they are fairly large (at least 460 feet or 140 meters in size), and because they follow orbits that pass close to the Earth's orbit (within 4.7 million miles or 7.5 million kilometers)," NASA officials explained in the image description
According to NASA, "being classified as a PHA does not mean that an asteroid will impact the Earth: None of these PHAs is a worrisome threat over the next 100 years. By continuing to observe and track these asteroids, their orbits can be refined and more precise predictions made of their future close approaches and impact probabilities."
NASA scientists and astronomers around the world are constantly searching for asteroids that may pose an impact threat to Earth. NASA has said that roughly 95 percent of the largest asteroids that could endanger Earth — space rocks at least 0.6 miles (1 km) wide — have been identified through these surveys.
At the Jet Propulsion Laboratory, NASA's Asteroid Watch project scientists work to share the latest asteroid discoveries and potential threats with the public. The Asteroid Watch is part of NASA's Near-Earth Object Program that studies asteroids and comets, as well as their potential impact threats to the Earth and other planets.
The risk of asteroid impacts like the meteor explosion that devastated a Russian city earlier this year may be 10 times greater than previously thought, several new studies on the meteor's origin and power reveal.
The meteor explosion over Chelyabinsk, Russia, on Feb. 15 was the first video-recorded meteor known to cause substantial damage and injuries. It was the largest airburst on the planet since the famed Tunguska event in 1908, also in Russia. Divers recovered a coffee-table-size chunk of the Chelyabinsk meteoriteweighing about 1,430 pounds (650 kilograms), the largest fragment unearthed yet, from the bottom of Russia's Lake Chebarkul on Oct. 16. Satellites also watched it streak through the atmosphere.
No so much chance of 10 days. An Earth killer would be spotted farther out than that. Probably so for 10 years as well.
So basically, Earth is...absolutely 100 % is...screwed. We don't know when, and it could as easily be 100,000 years as it could be 10 years or days...but we are screwed.
For the record, and I won't bother arguing about it on this thread, I think the Chelyabinsk event looked like it was hit by a missile or was a missile, as a matter of fact, based on various details.
reply to post by Mianeye
And these are the ones we KNOW about!
To that end, we can always donate to The B612 Foundation which is dedicated to finding the ones we don't know about and devising spacecraft to deflect them before they present real bad day for part of the Earth.
There is the statistical possibility of an asteroid hit, according to research, a major hit like dinosaur wipeout is due, but let's hope technology can do something about it if it got near.
Current data suggests that the most general cause of mass extinctions has been massive volcanism, even if other events may have intervened (asteroid impacts) and made some of these extinctions even worse.
Volcanic flows likely occurred as "pulses", with some flows being truly gigantic. Evidence has been found in the field for flows that had original volumes in excess of 10,000 cubic kilometers and erupted in less than a hundred years, possibly only a decade (Fig. 3). For comparison, the largest historical basaltic eruption that occurred in 1783 in Iceland (Laki) erupted some 15 km3 of lava in about a year. So a single huge Deccan flow could have amounted to at least 667 Laki over less than 100 years, or even 100 Laki over about 15 years! The amount of carbon and sulfur dioxides injected in the atmosphere from just one of these very large eruptions would have been truly gigantic, actually on the same order as those ejected by the asteroid impact on Yucatan, which fell on crust rich in carbon and sulfur and vaporized them.
The Cretaceous–Paleogene (K–Pg) extinction event,[a] formerly known as the Cretaceous–Tertiary (K–T) extinction, was a mass extinction of some three-quarters of plant and animal species on Earth—including all non-avian dinosaurs—that occurred over a geologically short period of time 66 million years (Ma) ago. It marked the end of the Cretaceous period and with it, the entire Mesozoic Era, opening the Cenozoic Era which continues today.
In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary, which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows high levels of the metal iridium, which is rare in the Earth's crust but abundant in asteroids.
It is generally believed that the K–Pg extinction was triggered by a massive comet/asteroid impact and its catastrophic effects on the global environment, including a lingering impact winter that made it impossible for plants and plankton to carry out photosynthesis. The impact hypothesis was bolstered by the discovery of the 180-kilometre-wide (112 mi) Chicxulub crater in the Gulf of Mexico in the late 1970s, which provided conclusive evidence that the K–Pg boundary clay represented debris from an asteroid impact. The fact that the extinctions occurred at the same time as the impact provides strong situational evidence that the K–Pg extinction was caused by the asteroid. However, some scientists maintain the extinction was caused or exacerbated by other factors, such as volcanic eruptions, climate change, and/or sea level change.
A wide range of species perished in the K–Pg extinction. The most well-known victims are the non-avian dinosaurs. However, the extinction also hit other terrestrial organisms, including mammals, pterosaurs, birds, lizards, insects, and plants. In the oceans, the K–Pg extinction devastated the giant marine lizards (Mosasauridae), plesiosaurs, fish, sharks, mollusks (especially ammonites) and many species of plankton. It is estimated that 75% or more of all species on Earth vanished. Yet the devastation caused by the extinction also provided evolutionary opportunities. In the wake of the extinction, many groups underwent remarkable adaptive radiations — a sudden and prolific divergence into new forms and species within the disrupted and emptied ecological niches resulting from the event. Mammals in particular diversified in the Paleogene, producing new forms such as horses, whales, bats, and primates. Birds, fish and perhaps lizards also radiated.
Is there a genocidal countdown built into the motion of our solar system? Recent work at Cardiff University suggests that our system's orbit through the Milky Way encounters regular speedbumps - and by "speedbumps" we mean "potentially extinction-causing asteroids".
Professor William Napier and Dr Janaki Wickramasinghe completed computer simulations of the motion of the Sun in our outer spiral-arm location in the Milky Way that revealed a regular oscillation through the central galactic plane, where the surrounding dust clouds are the densest. The solar system is a non-trivial object, so its gravitational effects set off a far-reaching planetoid-pinball machine which often ends with comets being hurled into the intruding system.
The sun is about 26,000 light-years from the center of the Milky Way Galaxy, which is about 80,000 to 120,000 light-years across (and less than 7,000 light-years thick). We are located on on one of its spiral arms, out towards the edge. It takes the sun -and our solar system- roughly 200-250 million years to orbit once around the Milky Way. In this orbit, we are traveling at a velocity of about 155 miles/sec (250 km/sec).
Many of the ricocheted rocks collide with planets on their way through our system, including Earth. Impact craters recorded worldwide show correlations with the ~37 million year-cycle of these journeys through the galactic plane - including the vast impact craters thought to have put an end to the dinosaurs two cycles ago.
Almost exactly two cycles ago, in fact. The figures show that we're very close to another danger zone, when the odds of asteroid impact on Earth go up by a factor of ten. Ten times a tiny chance might not seem like much, but when "Risk of Extinction" is on the table that single order of magnitude can look much more imposing.
You have to remember that ten times a very small number is still a very small number - and Earth has been struck by thousands of asteroids without any exciting extinction events. A rock doesn't just have to hit us, it has to be large enough to survive the truly fearsome forces that cause most to burn up on re-entry.
Professors Medvedev and Melott of the University of Kansas have a different theory based on the same regular motion. As the Sun ventures out "above" the galactic plane, it becomes increasingly exposed to the cosmic ray generating shock front that the Milky Way creates as it ploughs through space. As we get closer to this point of maximum exposure, leaving the shielding of the thick galactic disk behind, the Kansas researchers hold that the increasing radiation destroys many higher species, forcing another evolutionary epoch. This theory also matches in time with the dinosaur extinction.
The Cretaceous-Tertiary Boundary (KTB or KPg for Cretaceous-Paleogene) mass extinction is primarily known for the demise of the dinosaurs, the Chicxulub impact as the presumed sole cause and the associated frequently rancorous 30 years old controversy. But there is more to this mass extinction. Among the five major mass extinctions, only the KT can be shown to have a close correspondence between the mass extinction, an iridium anomaly, a large impact crater (Chicxulub) plus one small crater (Boltysh), one of the largest continental flood basalt eruptions (Deccan Traps) and major climate and sea level changes. Given the revolution in understanding of these events particularly over the past decades this simple impact-kill scenario is simply no longer adequate.
I see you putting out this theory in ATS threads time and again, but I'd like to ask you something.
Is, according to this theory, the asteroid thread completely fabricated or blown out of proportions? What about the fact that population, in general, is ignorant of such threat or of NASA's asteroid campaigns?
Rogue states is a subjective matter; in my book Israel is a rogue state. There's nothing rogue about Cuba or Iran.
Suppose the strategy you described is applied to the Americans, and they are kept in the dark about the "true purposes", what about the rest of the world? If there are American space weapons being developed and deployed, I'd think Russia, India and China would be the first onto that.