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. Interplanetary impacts have also been proposed to explain the retrograde rotation of Uranus and Venus.

2022年9月26日 · Impact event, collision of astronomical objects. Most collisions involve asteroids, comets, or meteoroids colliding with larger objects, such as planets or moons. Most impact events involve relatively small objects, but others involve large …

2018年12月19日 · An impact event is the collision of astronomical objects, especially of meteoroids with terrestrial planets. Learn more about earth's notable impact events.

2025年2月28日 · The most critical event occurred about 372 million years ago, partway through the Late Devonian. It had wide ranging impacts on life: 75% of species, 35% of genera, and 19% of taxonomic families died out. This extinction seems to have mostly impacted marine life, although little is known on its impact on land organisms.

Earth impact hazard, the danger of collision posed by astronomical small bodies whose orbits around the Sun carry them near Earth; when collisions occur, they are known as "impact events." These objects include the rocky asteroids and their larger fragments and the icy nuclei of comets .

2022年9月14日 · According to the Giant Impact Hypothesis, 4.5 billion years ago, a planetesimal the size of Mars, dubbed Theia, slammed into Earth. The debris ejected by the impact entered orbit around our...

2022年9月1日 · Over the past few decades, it has become increasingly clear that the impact of interplanetary bodies on other planetary bodies is one of the most ubiq…

2016年5月25日 · The sizes of the orange dots (daytime impact events) and the blue dots (nighttime impacts) are proportional to the energy released in the impact and show the location of impacts from objects ~1 to 20 meters in size. ... While we know that small asteroid impacts with Earth are not unusual, the risk of future, possibly larger, impacts is not to ...

When two objects collide it is called an impact event: The basic idea is simple – objects in space sometimes run into one another. If they are the same size (and perhaps moving very fast with respect to one another), like two asteroids, the collision might result in both of the bodies getting smashed to pieces.

Welcome to the Earth Impact Effects Program: an easy-to-use, interactive web site for estimating the regional environmental consequences of an impact on Earth. This program will estimate the ejecta distribution, ground shaking, atmospheric blast wave, and thermal effects of an impact as well as the size of the crater produced.