“WHAT IS GOING ON!..” NASA Admits Something Big Is Coming (2021)
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An impact event is a collision between astronomical objects causing measurable effects. Impact events have physical consequences and have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effect. When large objects impact terrestrial planets such as the Earth, there can be significant physical and biospheric consequences, though atmospheres mitigate many surface impacts through atmospheric entry. Impact craters and structures are dominant landforms on many of the Solar System’s solid objects and present the strongest empirical evidence for their frequency and scale. steroid 4660 Nereus will reach its closest proximity to our planet that day, according to NASA, but it will still be about 2.5 million miles away from Earth.
While that may sound like a lot, NASA deems any object that comes within 30 million miles of Earth’s orbit a “near-Earth object.” NASA classifies any object greater than 500 feet in size that passes within 4.7 million miles of Earth’s orbit “potentially hazardous” based on “the asteroid’s potential to make threatening close approaches to Earth.”
Impact events appear to have played a significant role in the evolution of the Solar System since its formation. Major impact events have significantly shaped Earth’s history, and have been implicated in the formation of the Earth–Moon system, the evolutionary history of life, the origin of water on Earth and several mass extinctions. The prehistoric Chicxulub impact, 66 million years ago, is believed to be the cause of the Cretaceous–Paleogene extinction event.
An asteroid is a minor planet of the inner Solar System. Historically, these terms have been applied to any astronomical object orbiting the Sun that did not resolve into a disc in a telescope and was not observed to have characteristics of an active comet such as a tail. As minor planets in the outer Solar System were discovered that were found to have volatile-rich surfaces similar to comets, these came to be distinguished from the objects found in the main asteroid belt. Thus the term "asteroid" now generally refers to the minor planets of the inner Solar System, including those co-orbital with Jupiter. Larger asteroids are often called planetoids.
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