Four days after the meteorite exploded, the resulting dust plume had travelled around the atmosphere of the Northern Hemisphere and all the way back to Chelyabinsk. Even three months later, traces of the dust belt remained around Earth.
20, 000 rescue and clean-up workers were sent to the Chelyabinsk region to help ease disruption. The damage costs amounted to more than $30 million.
There are about 150 known impact craters on Earth. The biggest is Vredefort Dome in South Africa which is over 300km and about 2 billion years old.
There are distinct terms of these different space phenomena: meteors or shooting stars are the light seen in the sky when interplanetary debris burns up as it passes through our atmosphere. “Meteoroid” refers to this debris. “Meteorite” is refers to any portion of a meteoroid that survives the trip through our atmosphere.
An impact event 65 million years ago is believed to have caused the extinction of around half of the all the species living on the planet, including the dinosaurs.
The frequency of meteor impacts is called the impact flux. The flux was at its peak shortly after the solar system was formed when there were twice as many impacts as in modern times. This was known as the Great Bombardment
The Earth is constantly hit by space debris. Most of it is tiny in the form of cosmic dust, but every year around 40,000 asteroids of varying sizes also hit in the planet.
Up to 17th September 2013, 10216 near-Earth asteroids have been recorded by US Space agency NASA. Some 858 of these asteroids are over one kilometre wide and 1423 have been classified as ‘potentially hazardous’.
Meteor showers are hundreds, if not thousands, of shootings stars burning up in our atmosphere in a short period. In fact most nights around 8 meteors can be spotted through a clear sky.
The Chelyabinsk meteorite is a stony meteorite which means it’s mostly made up of rocky silicate minerals. It is the most common type. The other types are iron meteorites which are predominantly iron based in their composition and stony-iron ones which are made of a mixture of rocky minerals and iron-nickel.
ICE TSUNAMI FACTS
Given its size of 200 square miles, Lake Mille Lacs is relatively shallow. The lowest point is barely 40 feet and it averages at 20-38 feet in depth.
Lake Dauphin is the same size as Lake Mille Lacs at 200 square miles but longer and thinner. It is also very shallow with a maximum depth of just over 11 feet or 3.4m.
Lake Dauphin and the nearby town were named after the heir to the French throne in 1739.
Ice is in fact lighter or less dense than water, which is why it floats. It’s also why lakes freeze from top to bottom creating an ice sheet under which the fish and other lake life can continue to live during the winter.
Ice shoves are known as Ivu by the Inupiat Eskimos of North Alaska
The name of Mille Lacs is French for "one thousand lakes". In the Ojibwe language the lake is called Misi-zaaga'igan ("grand lake").
Mille Lacs has many species of fish including walleye, northern pike, muskie, jumbo perch, smallmouth bass, largemouth bass, black crappie, burbot, and tullibee.
Mille Lacs is one of Minnesota's most popular fishing lakes. Ice fishing houses number in the thousands during the winter.
It is a prime spawning grounds for walleye. Billions of walleye eggs and fry are produced there every year. In the absence of a thermocline, fish can travel the whole area of the lake.
However because of falling numbers there are increasing limits to the amount of fish that can be caught.