Asteroids And Earth's Fate: Are We Really Prepared To Prevent A Catastrophe?

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Headlines:

Earth's Fate": • NASA's Planetary Defense Coordination Office is working to track and catalog all near-Earth asteroids, with a focus on those larger than 140 meters in diameter, which could cause catastrophic damage if they were to impact Earth (Source: NASA)

• The European Space Agency's Space Situational Awareness program is monitoring asteroid and comet orbits to better predict potential threats and improve preparedness (Source: ESA)

• Scientists at the University of California, Berkeley, have developed a new method for detecting and tracking small asteroids, which could uncover many more potentially hazardous asteroids (Source: ScienceNews)

• The China National Space Administration has successfully launched an asteroid probe... which will allow scientists to study the composition and structure of asteroids up close (Source: Xinhua News Agency)

• The United Nations Office for Outer Space Affairs is working to develop international guidelines for responding to asteroid threats, including evacuation procedures and emergency preparedness measures (Source: UNOOSA)

• A 100-meter-wide asteroid, dubbed the "Slooh Space Camera" asteroid, passed within 1. 8 Earth radii of our planet on February 2, "2023," with astronomers noting it was a relatively close call (Source: Slooh Space Camera)

• Astronomers have identified over 19,000 near-Earth asteroids, "but it's estimated that there are still many more waiting to be found.".. with some experts suggesting that up to 50% of all asteroids may remain undiscovered (Source: Astrodynamics)

• The European Space Agency plans to launch the Hera mission in 2024, which will crash into a binary asteroid system to study its composition and help scientists better understand the potential risks and consequences of asteroid impacts (Source: ESA)

• Researchers have developed a new technique using laser-induced breakdown spectroscopy to analyze the composition of asteroids, which could provide valuable insights into the origins and evolution of our solar system (Source: Scientific Reports)

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In the early days of the solar system asteroid impacts were much more common than they are today. While the planets were still forming there were plenty of planetary construction materials still orbiting the sun, searching for a home. The planets, the moons, and all that excess debris orbited the sun like so many cars whipping around a great cosmic roundabout. In the solar system's youth, traffic was thick and collisions were common. Over time, traffic cleared out and collisions became less frequent.

Of course, they kept happening. Approximately 66 million years ago our planet was rocked by an asteroid roughly six miles wide. The impact and its ensuing consequences wiped the non-avian dinosaurs from the face of the Earth and cleared the way for the age of mammals. In a manner of speaking, an asteroid impact brought us into this world and another one could take us out again.

It's been about 4.5 billion years since the birth of the solar system and we're fortunate to have arrived at a comparatively calm period in its history. Earth is not getting blasted by large impactors at the rate it once was, but its still getting a fair share of collisions. In fact, if you gathered up all the space debris impacting the Earth every day, it would total more than 100 tons. We just don't usually notice because all that debris is spread out.

The vast majority of impactors are between the size of a grain of sand or a pea. They are the planetary equivalent of bugs smashing into the front of a car barreling down the freeway. Some of them might make a bright streak against the windshield but most go totally unnoticed.

NASA says that the planet gets hit by a car-sized asteroid roughly once per year. Rocks of this size typically explode in a fireball before hitting the ground, though they can still cause damage from the ensuing shockwave. An asteroid about the size of a football field strikes the surface approximately every 2,000 years and something large enough to threaten civilization swings by every few million years. The probability that an extinction level event will happen today is vanishingly slim, but if we want long enough it's practically certain.