The formula for area of a circle is a = πr2. If the radius is 85km, the area would be approximately 22686.5 km2.
Depending on where it hits, it might be anywhere from very damaging to catastrophic. If it were to strike in a sparsely inhabited area like Siberia or the Australian "Outback", it would likely cause very serious damage to everything within about a 300 KM radius, dig a substantial crater, and scatter ejecta over a radius of 400 km or more. If it were to strike a populous area like India, Europe or the Americas, the death toll could be in the hundred-million plus range. A water impact might cause a tsunami capable of inundating all the surrounding coastlines. An asteroid impact in the Indian Ocean about 4000 years ago may have caused a tsunami throughout the Indian Ocean basin, giving rise to the near-universal legends about a great flood; Noah and the Ark, and the Sumerian Gilgamesh epics, for example. And there are apparently Australian Aboriginal "Dreamtime" legends recounting a flood. See the link below for the Impact Effects Calculator to figure out what might happen if an asteroid were to strike the Earth.
There is no known documented case of a person being killed directly by an asteroid impact. However, there have been instances where asteroids have caused damage and injuries due to their explosions or shock waves upon impact, like the Tunguska event in 1908 in Siberia.
Historically, an asteroid that struck the Earth 65 million years ago is one theory for the extinction of the dinosaurs, but that hit in Yucatan (Mexico).
99942 Apophis is an asteroid where initial observations indicated a small probability (up to 2.7%) that it would strike the Earth in 2029.Later observations concluded that the asteroid would miss the Earth.The chances are now set at a one in 3 million that it will hit Earth.
The meteorite that struck Earth approximately 49,000 years ago created the Barringer Crater, also known as Meteor Crater, located in Arizona, USA. This impact event is one of the best-preserved meteorite impact sites on Earth and is about 1,200 meters (4,000 feet) in diameter. The crater was formed by a nickel-iron meteorite about 50 meters (160 feet) in diameter, which struck the Earth at a speed of about 20 kilometers per second (45,000 miles per hour).
Barringer or Meteor Crater Arizona is a good example
The Chicxulub crater is the area in the state of Yucatan that was hit by an asteroid. It is about 66 million years old.
Weathering and erosion tend to level out crater features, whether impact or volcanic, over time. The atmosphere also protects the surface from many meteor impact events, by burning them up before they strike.
Depending on where it hits, it might be anywhere from very damaging to catastrophic. If it were to strike in a sparsely inhabited area like Siberia or the Australian "Outback", it would likely cause very serious damage to everything within about a 300 KM radius, dig a substantial crater, and scatter ejecta over a radius of 400 km or more. If it were to strike a populous area like India, Europe or the Americas, the death toll could be in the hundred-million plus range. A water impact might cause a tsunami capable of inundating all the surrounding coastlines. An asteroid impact in the Indian Ocean about 4000 years ago may have caused a tsunami throughout the Indian Ocean basin, giving rise to the near-universal legends about a great flood; Noah and the Ark, and the Sumerian Gilgamesh epics, for example. And there are apparently Australian Aboriginal "Dreamtime" legends recounting a flood. See the link below for the Impact Effects Calculator to figure out what might happen if an asteroid were to strike the Earth.
Probably not. I haven't seen any news about an asteroid about to strike Earth.
When meteorites or other objects strike the Moon, they create impact craters. These craters vary in size and shape depending on the size and velocity of the impacting object. Over time, the continuous bombardment has formed the cratered surface we see on the Moon today.
There is no known documented case of a person being killed directly by an asteroid impact. However, there have been instances where asteroids have caused damage and injuries due to their explosions or shock waves upon impact, like the Tunguska event in 1908 in Siberia.
Prehistoric Disasters - 2009 Asteroid Strike 1-4 was released on: USA: June 2009
Historically, an asteroid that struck the Earth 65 million years ago is one theory for the extinction of the dinosaurs, but that hit in Yucatan (Mexico).
The Daily Orbit - 2012 Could an Asteroid Strike in 2032 - 2.38 was released on: USA: 19 October 2013
An asteroid can indeed damage a planet when it strikes it. It is possible that an asteroid strike resulted in the dying off of the dinosaurs on Earth. There are certainly some large craters on Earth that are suggestive of asteroid strikes.
Meteor Crater was formed by a meteor strike, not a guided missile from space. Call it a random act of nature.