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Archive for the ‘asteroid/comet impacts’ category: Page 10

Apr 1, 2021

Particles of a Meteor Explosion From 430,000 Years Ago Found Hidden in Antarctic Ice

Posted by in categories: asteroid/comet impacts, existential risks, particle physics

Approximately 430000 years ago, a meteorite exploded over Antarctica.

The only reason we know about it now is because scientists have just found tiny, once-molten particles of space rock that have been hidden away in the ice ever since.

Based on an analysis of those particles, the event was an unusual one — not quite powerful enough to produce an impact crater, but nor was it a lightweight. The jet of melted and vaporized material that blasted from the mid-air explosion would have been more hazardous than the Tunguska event that flattened a Siberian forest in 1908.

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Mar 30, 2021

Asteroid collision ruled out for 100+ years

Posted by in categories: asteroid/comet impacts, existential risks

A collision between Earth and the asteroid 99942 Apophis can be ruled out, for at least the next century, based on new observations by NASA.

Mar 28, 2021

Earth is safe from a 340-metre asteroid for the next century, NASA says

Posted by in categories: asteroid/comet impacts, existential risks

NASA gives Earth the all-clear for the next century, removing a particularly menacing asteroid, Apophis, from its “risk list”.

Mar 15, 2021

NASA’s Planetary Defense: “Potentially Hazardous Asteroid” Predicted to Safely Pass by Earth on March 21

Posted by in categories: asteroid/comet impacts, existential risks

The interplanetary interloper won’t come closer than 1.25 million miles to Earth, but it will present a valuable scientific opportunity for astronomers.

The largest asteroid predicted to pass by our planet in 2021 will be at its closest on March 21, providing astronomers a rare opportunity to get a good look at a rocky relic that formed at the dawn of our solar system.

Called 2001 FO32, the near-Earth asteroid will make its closest approach at a distance of about 1.25 million miles (2 million kilometers) – or 5 1/4 times the distance from Earth to the Moon. There is no threat of a collision with our planet now or for centuries to come.

Continue reading “NASA’s Planetary Defense: ‘Potentially Hazardous Asteroid’ Predicted to Safely Pass by Earth on March 21” »

Mar 12, 2021

Scientists Are Planning to Build Noah’s Ark on the Moon

Posted by in categories: asteroid/comet impacts, cryonics, existential risks, life extension

Earth is destined for disaster. This is a good insurance policy.


In 2013, a cataclysmic meteor the size of a six-story building broke apart above Chelyabinsk, Russia, and the resulting blast was stronger than a nuclear explosion. In 2068, astronomers believe a potentially hazardous “God of Chaos” asteroid could slam into Earth. Both events suggest humans—and every other animal and plant on Earth—are much more susceptible to total annihilation than we think.

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Feb 28, 2021

Did A Comet Fragment Kill The Dinosaurs? Not Likely, Say Researchers

Posted by in categories: asteroid/comet impacts, existential risks

The latest hypothesis that the demise of the dinosaurs was precipitated by a cometary fragment that slammed into the Gulf of Mexico some 66 million years ago is being met with skepticism in the Earth sciences community.

Feb 20, 2021

An asteroid is approaching, so I invited one of Earth’s defenders to dinner

Posted by in categories: asteroid/comet impacts, existential risks, satellites

Near-Earth Asteroid 99942 Apophis will be visible on Sunday. Some say it could ultimately destroy satellites and spaceships. The creators of the Unistellar eVscope telescope are trying to marshal our defense.

Feb 15, 2021

How Jupiter Set Off A Chain Of Events That Killed The Dinosaurs

Posted by in categories: asteroid/comet impacts, existential risks

A fragment of a large, long-period comet was most likely responsible for the impactor that killed off the dinosaurs.

Jan 3, 2021

NASA, FEMA, International Partners Plan Asteroid Impact Exercise

Posted by in categories: asteroid/comet impacts, existential risks, health

Each day this week, we will be providing updates on a fictional impact scenario playing out at the International Planetary Science Conference in College Park, Maryland. This scenario is designed to help key decision makers practice for a real asteroid impact. Currently, there is no known asteroid with a significant probability of impacting Earth in the next century. Day 5: What Was This Exercise All About? This week at the 2019 Planetary Defense Conference, conference participants were tasked with responding to a hypothetical asteroid impact scenario in which they have eight years to stop an asteroid on a collision course with Earth. Every day, the audience heard updates — at one point, they weren’t sure whether the 140–260-meter-wide (500−850 feet) asteroid was actually going to hit Earth. Once they found out it was on a certain collision, NASA and space agencies around the world decided to send a fleet of kinetic impactors to deflect the asteroid. The kinetic impactors hit the asteroid…but ended up splitting off a chunk, which, on Day 4 (four years from impact), again was headed towards Earth.


While headlines routinely report on “close shaves” and “near-misses” when near-Earth objects (NEOs) such as asteroids or comets pass relatively close to Earth, the real work of preparing for the possibility of a NEO impact with Earth goes on mostly out of the public eye.

Jan 2, 2021

Scientists: Life on Earth Likely Started in Meteor Craters

Posted by in categories: asteroid/comet impacts, existential risks

A new study is flipping the script on the effects of massive meteor impacts. While an ancient impact is commonly to the extinction event that killed the dinosaurs, scientists are now starting to suspect that an earlier impact could have jumpstarted life on Earth in the first place.

Scientists have long suggested that meteorites carried the ingredients necessary for life to Earth, but new research suggests that meteor impacts also created the ideal conditions for life to emerge as well, The Weather Network reports. Because of that, the scientists suggest that space agencies ought to pay special attention to similar craters when hunting for life on the Moon, Mars, or beyond.

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