A bolide (asteroid or comet) is defined as a meteor brighter than Venus in the night sky, i.e., a fireball. Bolide impacts have been an essential part of the development of the solar system. The frequency and scale of bolide impacts are recorded in impact structures observed on the surfaces of planets and moons in our solar system.
This book tells the story of the catastrophic impact of the giant 10 Km asteroid Chicxulub into the ancient Gulf of Mexico 65.5 million years ago. The book begins with a discussion of the nature of asteroids and the likelihood of future Earth-impacts.
This contribution will focus on the local geobiological effects of impacts. The impact of an asteroid and comet with the surface of the Earth has two profound effects that are relevant for life. First, the impact delivers energy into the target area with important geological consequences and second, it rearranges the hydrologic cycle, with

The last major asteroid impact on Earth was around 65 million years ago, when an asteroid around 6 to 9 miles (10 to 15 kilometres) wide struck the Earth in what is now the Yucatan Peninsula. The resulting impact was truly apocalyptic, eventually wiping out over 75% of all life on Earth, including the dinosaurs. If such an event were to happen

A direct impact from such a rock wouldn't be cataclysmic like the roughly 7.5-mile-wide (12 kilometers) dinosaur-killing asteroid that crashed to Earth 66 million years ago. However, 2023 DW could Apophis is an asteroid about 270 meters across (almost three football fields). In 2029 it will pass very close to the Earth: within the orbits of our communication satellites. It won't hit; however there is a slight chance that this close pass will shift its orbit exactly the right amount to cause it to hit Earth on a second pass in 2036.
Some of them have even caused a major impact and even triggered an extinction-level event. An asteroid was responsible for triggering the extinction of dinosaurs when it crashed on Earth near the near the Yucatan Peninsula in Mexico more than 65 million years ago.

The Late Ordovician mass extinction ( LOME ), sometimes known as the end-Ordovician mass extinction or the Ordovician-Silurian extinction, is the first of the "big five" major mass extinction events in Earth's history, occurring roughly 445 million years ago (Ma). [1] It is often considered to be the second-largest known extinction event, in

Headquarters, Washington. 301-286-6284 / 202-358-2307 / 202-358-1501. karen.c.fox@nasa.gov / joshua.a.handal@nasa.gov / alana.r.johnson@nasa.gov. 2021-234. The new system improves the capabilities of NASA JPL’s Center for Near Earth Object Studies to assess the impact risk of asteroids that can come close to our planet. 3twXp6.
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    • major asteroid impacts on earth