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asteroid Empire

Asteroid the size of Empire State Building nears earth this weekend – The Jerusalem Post

The asteroid is estimated to be 1,100 ft. in diameter, while the Empire State Building stands at approximately 1,400 ft. tall.

By CELIA JEAN
 

JUNE 7, 2020 21:13

Artist's Impression of a collision of two icy asteroid-sized bodies orbiting the bright star Fomalhaut (photo credit: REUTERS)

Artist’s Impression of a collision of two icy asteroid-sized bodies orbiting the bright star Fomalhaut

(photo credit: REUTERS)

An asteroid almost as tall as the Empire State Building in New York is expected to fly near Earth this weekend.

Asteroid 2002 NN4 is set to pass by the Earth on June 6, according to the space agency’s asteroid watch widget, which provides easy access to information on the next five asteroids expected to pass by our planet. 

Information provided on the widget shows the asteroid, named Asteroid 2002 NN4, to be approximately 1,100 ft. in diameter (about 335 meters), while the Empire State Building stands at approximately 1,400 ft. (426 meters).

Despite information provided by the widget putting the asteroid at 300 ft. shorter than the iconic building, more in depth information listed about the asteroid on NASA’s Center for Earth Object Studies (CNEOS) website, which monitors close approaches to Earth, approximates the asteroid to be anywhere from 820-1,870 ft. (250-570 m.) in diameter. 

The asteroid will be at its nearest to Earth at a distance of 3,160,000 miles.  

The widget shows the next five asteroids that are expected to come within 4.6 million miles of Earth, and provides size comparison pictures of on-earth objects. While Asteroid 2002 NN4 has been compared to the average size of a sports stadium, another asteroid also expected to pass near earth on the same day is shown to be the size of an airplane, nearing Earth at a distance of only 890,000 miles. 

More than 30 Near Earth Objects are discovered each week, roughly 1,500 per year, according to NASA’s Planetary Defense website. Roughly half of the known NEOs are objects larger than about 460 ft. (140 m.) in size. The estimated population of NEOs of this size is about 25,000. 

In 2019, when just over 19,000 had been discovered, scientists from NASA and other space agencies from around the world gathered for an international Planetary Defense Conference, one of many steps in the agency’s preparedness plans in case an asteroid were to hit Earth. 





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asteroid Football

An asteroid the size of six football fields will speed by Earth Saturday night – CNN

(CNN)An asteroid estimated to be the size of six football fields will whiz past Earth Saturday night — but no, you’re not in danger.

Asteroid 2002 NN4 will pass by Earth on Saturday at 11:20 p.m. ET, NASA says. At an estimated diameter of up to 1,870 feet, according to the Center for Near Earth Object Studies, it’ll definitely seem like a big one.
But, it’ll be about 3.2 million miles away from our planet, 13 times further away than the moon, NASA says, so there’s truly no reason to worry.
And these kinds of occurrences are pretty normal. Last August, an asteroid estimated to be about the same size as 2002 NN4 passed by Earth, and experts at the time called it moderately sized.
And, this asteroid is less than a mile long. The biggest known asteroid that orbits the sun is a whopping 21 miles long, Lindley Johnson of NASA’s Planetary Defense Coordination Office told CNN last year.
Still, the probability of an asteroid actually hitting Earth is pretty slim — occurring once every two or three centuries, Johnson said at the time.
In 2013, a meteor just 55 feet in diameter broke through the Earth’s atmosphere over Russia. The meteor didn’t actually make impact with the planet, but the blast still injured more than 1,000 people.
Being millions of miles away, that shouldn’t be the case with 2002 NN4. So you can spend Saturday evening relaxing, knowing that an asteroid is in fact not coming to blast us. Today, at least.
The next time 2002 NN4 will be anywhere near this close to us is in June 2029.

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asteroid Dinosaur-killing

Dinosaur-killing asteroid created massive magma chamber that lasted millions of years, study shows – Fox News

The asteroid that slammed into Earth some 66 million years ago and wiped out the dinosaurs also produced a gigantic pool of magma many times larger than the crater at the center of Yellowstone National Park, new research reveals.

The incident, known as the Chicxulub impact event, killed off 75 percent of all life on Earth, and it also produced a massive hydrothermal system filled with magma, according to research published today in Science Advances.

The impact produced about 100 million megatons of energy and likely created winds in excess of 600 miles per hour near the blast’s center — wiping out vegetation, soil and animals.

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That energy was enough to melt part of our planet’s crust, creating what the researchers call a “central melt pool” of magma that lasted for hundreds of thousands of years, according to the study.

“Chicxulub is the largest, best-preserved crater on Earth and is thus our best example of the craters that were produced early in Earth history,” David Kring, the first author of the study and a researcher from the Lunar and Planetary Institute in Texas, explained to Gizmodo.

The dinosaur-killing asteroid that struck Earth produced a gigantic pool of magma.

The dinosaur-killing asteroid that struck Earth produced a gigantic pool of magma.
(SWNS)

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“There were thousands of craters its size and larger when life emerged on Earth. There is evidence that suggests that life emerged from hydrothermal systems, potentially produced by impacting asteroids and comets,” he added.

For the study, Kring and his colleagues examined chemically altered rocks pulled from the Chicxulub crater. A drilling expedition led by two groups of international scientists provided the samples, after having acquired them from deep below the seafloor.

A different study released earlier this week found that the asteroid slammed into Earth at the “deadliest possible angle” of about 60 degrees, which maximized the amount of climate-changing gases that were thrust into the upper atmosphere.

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asteroid Dinosaur-Killer

The Dinosaur-Killer Asteroid May Have Hit Earth at ‘Deadliest Possible’ Angle – ScienceAlert

PHINEAS RUECKERT, AFP


27 MAY 2020

This much we knew: some 66 million years ago an asteroid roughly twice the diameter of Paris crashed into Earth, wiping out all land-dwelling dinosaurs and 75 percent of life on the planet.

What remained a mystery was whether it was a direct hit or more of a glancing blow, and which would be more destructive.

As it turns out, according to a study published Tuesday in Nature Communications, the giant space rock struck at the “deadliest possible” angle – 60 degrees.

The cataclysmic impact kicked up enough debris and gases into the upper atmosphere to radically change the climate, dooming Tyrannosaurus rex and everything it ever hunted to extinction.

Analysing the structure of the 200-kilometre-wide (125 mile) crater in southern Mexico where the asteroid hit, scientists ran a series of simulations.

41467 2src2src 15269 Fig2 HTMLImpact modelling. (Collins et al., Nature Communications, 2020)

Lead author Gareth Collins of Imperial College London and colleagues at the University of Freiburg and the University of Texas at Austin looked at four possible impact angles – 90, 60, 45 and 30 degrees – and two impact speeds, 12 and 20 kilometres per second (7.5 and 12.4 miles per second).

The best fit with the data from the crater was a 60 degree strike.

“Sixty degrees is a more lethal impact angle because it ejects a larger amount of material fast enough to engulf the planet,” Collins told AFP.

“The Chicxulub impact triggered a mass extinction because it ejected huge quantities of dust and gas out of the crater fast enough to disperse around the globe.”

Had the asteroid hit head on or at a more oblique angle, not as much debris would have been thrown up into the atmosphere, he added.

Large amounts of sulphur in the form of tiny particles that remained suspended in the air blocked the Sun, cooling the climate by several degrees Celsius.

Rocks ‘rebound’ 

Smoke, ash and debris engulfed the atmosphere, eventually destroying most plants and wiping out 75 percent of species on Earth.

Chicxulub is also thought to have triggered an earthquake whose seismic waves reached Tanis – the fossil site 3,000 km (1,864 miles) away in North Dakota where definitive evidence of the asteroid’s devastating impact was uncovered – in just 13 minutes.

The seismic shock triggered a torrent of water and debris from an arm of an inland sea known as the Western Interior Seaway.

Thus far, scientists have only been able to study the early stages of the impact. The researchers combed through geological data gathered during a recent dig to better understand how the cataclysm unfolded.

They soon realised that the asteroid did not, as long assumed, approach Earth from the southeast.

“Our work overturns this hypothesis,” Collins explained.

“The crater’s central uplift is leaning slightly to the southwest, and numerical simulations of the impact reproduce this.”

The findings could lead to a greater understanding about how craters are formed in general.

The 3D simulations, for example, suggest that rocks “rebound” to fill in some of the impact layer during the final stage of crater formation, a process that takes only minutes, the researchers conjectured.

Scientists are still trying to figure out exactly how the asteroid triggered a mass extinction event and why some species survived while others didn’t.

“The Chicxulub impact was a very bad day for the dinosaurs,” Collins said, adding that the new research showed it was “even worse” than had been previously thought.

“It makes it even more remarkable that life survived and recovered as rapidly as it did.”

© Agence France-Presse

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asteroid giant

This giant asteroid will fly by Earth Wednesday, close enough to see by telescope, but it won’t hit us, experts say – CNN

(CNN)An asteroid estimated to be 1.2 miles wide will fly by Earth early Wednesday morning, but it’s not expected to collide with our planet.

The asteroid is called 52768 (1998 OR2), and it was first spotted in 1998. On April 29, it will pass within 3,908,791 miles of Earth, moving at 19,461 miles per hour. That’s still 16 times farther than the distance between Earth and the moon.
The flyby is expected to occur at 5:56 a.m. ET, according to NASA’s Center for Near-Earth Object Studies. The center tracks Near-Earth Objects, or NEOs, that could collide with Earth. They have been tracking this particular asteroid for 20 years, according to NASA.
You can watch it live on The Virtual Telescope’s website. Gianluca Masi, founder and scientific director of The Virtual Telescope in Italy, has been tracking and imaging it for some time.
If it did impact Earth, the asteroid is “large enough to cause global effects,” according to NASA, back when the asteroid was first discovered.
And if an asteroid could be aware of such things, it appears to be wearing a face mask in deference to the pandemic, according to new images from Arecibo Observatory in Puerto Rico.
“The small-scale topographic features such as hills and ridges on one end of asteroid 1998 OR2 are fascinating scientifically,” said Anne Virkki, head of planetary radar at Arecibo Observatory, in a statement. “But since we are all thinking about Covid-19, these features make it look like 1998 OR2 remembered to wear a mask.”
Arecibo Observatory is a National Science Foundation facility managed by the University of Central Florida. A team of experts has been monitoring this near-Earth asteroid, among others. The observatory is supported by NASA’s Near-Earth Object Observations Program and has been analyzing asteroids since the mid-’90s.
During the pandemic, scientists at Arecibo are continuing to make their observations on behalf of planetary defense. In line with social distancing, they have limited the number of scientists and radar operators at the facility, and they’re wearing masks during observations.
The asteroid was classified as a potentially hazardous object because it’s bigger than 500 feet and comes within 5 million miles of Earth’s orbit. The experts at Arecibo can monitor the asteroids and use observations to determine their path in the future to see if they pose a risk to Earth.
“The radar measurements allow us to know more precisely where the asteroid will be in the future, including its future close approaches to Earth,” said Flaviane Venditti, a research scientist at the observatory, in a statement. “In 2079, asteroid 1998 OR2 will pass Earth about 3.5 times closer than it will this year, so it is important to know its orbit precisely.”
It’s the largest asteroid expected to zip by Earth within the next two months, but it’s not the largest ever.
That honor belongs to the asteroid 3122 Florence (1981 ET3), which flew by and luckily missed colliding with Earth on September 1, 2017. It will make another pass again on September 2, 2057. That asteroid is estimated to be between two and a half and five and a half miles wide.

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