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It measures 2.7 metres (9 feet) across, is estimated to weigh nearly 60 tons, and is made of an alloy of iron and nickel.The smallest meteorites, called micrometeorites, range in size from a few hundred micrometres (μm) to as small as about 10 μm and come from the population of tiny particles that fill interplanetary space (asteroids that orbit in the inner portion of the main asteroid belt, between about 2.1 and 3.3 astronomical units (AU) from the Sun.First, when the solar system began to form, it was composed of gas and fine-grained dust.The assembly of planet-sized bodies from this dust almost certainly involved the coming together of smaller objects to make successively larger ones, beginning with dust balls and ending, in the inner solar system, with the rocky, or terrestrial, planets—Mercury, Venus, Earth, and Mars.
One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).The principal driving force behind meteorite studies is the fact that small bodies such as asteroids and comets are most likely to preserve evidence of events that took place in the early solar system.There are at least two reasons to expect that this is the case.For instance, meteorite fragments have been found in samples returned from the Moon, and the robotic rover Opportunity has identified at least one meteorite on the surface of Mars.The largest meteorite that has been identified on Earth was found in 1920 in Namibia and was named the Hoba meteorite.
Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials.
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