When an asteroid crashed into Earth; then this happened
Earth keeps on pulling objects in outer space towards itself because of its strong gravitational pull. But imagine if every object starts hitting or crashing into the planet! Such events are rare though because when any object from outer space reaches Earth's atmosphere it gets destroyed to a large extent. Only a few objects like asteroids, meteors, etc. which are very large in size can manage to actually hit the Earth's surface. And when did that happen last, you would probably be thinking. The answer is shocking. It happened as recently as on March 15, 2022. Yes, an actual asteroid crashed into our planet.
According to the information provided by NASA, it was a small asteroid that hit Earth's atmosphere over the Norwegian Sea before largely disintegrating and then crashing into the planet. "But this event wasn't a complete surprise: Astronomers knew it was on a collision course, predicting exactly where and when the impact would happen," NASA said.
Two hours before the asteroid made impact, K. Sarneczky at the Piszkesteto Observatory in northern Hungary first reported observations of the small object to the Minor Planet Center – the internationally recognized clearinghouse for the position measurements of small celestial bodies. The object was posted on the Minor Planet Center's Near-Earth Object Confirmation Page to flag it for additional observations that would confirm it as a previously unknown asteroid.
NASA's “Scout” impact hazard assessment system then took these early measurements to calculate the trajectory of 2022 EB5. As soon as Scout determined that 2022 EB5 was going to hit Earth's atmosphere, the system alerted the Center for Near Earth Object Studies (CNEOS) and NASA's Planetary Defense Coordination Office, and flagged the object on the Scout webpage to notify the near-Earth object observing community.
Maintained by CNEOS at NASA's Jet Propulsion Laboratory in Southern California, Scout automatically searches the Minor Planet Center's database for possible new short-term impactors. CNEOS calculates every known near-Earth asteroid orbit to improve impact hazard assessments in support of the Planetary Defense Coordination Office.
From observations of the asteroid as it approached Earth and the energy measured by infrasound detectors at time of impact, 2022 EB5 is estimated to have been about 6 1/2 feet (2 meters) in size. Asteroids of this size get bright enough to be detected only in the last few hours before their impact (or before they make a very close approach to Earth). They are much smaller than the objects that the Planetary Defense Coordination Office is tasked by NASA with detecting and warning about.
“Tiny asteroids like 2022 EB5 are numerous, and they impact into the atmosphere quite frequently – roughly every 10 months or so,” said Paul Chodas, the director of CNEOS at JPL, as quoted by NASA. “But very few of these asteroids have actually been detected in space and observed extensively prior to impact, basically because they are very faint until the last few hours, and a survey telescope has to observe just the right spot of sky at the right time for one to be detected.”
A larger asteroid with hazardous impact potential would be discovered much farther from Earth. NASA's goal is to keep track of such asteroids and to calculate their trajectories in order to have many years' notice ahead of a potential impact should one ever be identified. But this real-world event with a very small asteroid allowed the planetary defense community to exercise capabilities and gave some confidence that the impact prediction models at CNEOS are highly capable of informing the response to the potential impact of a larger object.
"2022 EB5 is only the fifth small asteroid to be detected in space before hitting Earth's atmosphere. The first asteroid to be discovered and tracked well before hitting Earth was 2008 TC3, which entered the atmosphere over Sudan and broke up in October 2008. That 13-foot-wide (4-meter-wide) asteroid scattered hundreds of small meteorites over the Nubian Desert. As surveys become more sophisticated and sensitive, more of these harmless objects will be detected before entering the atmosphere," NASA informed.