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How much is an asteroid?

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Asteroid: A relatively small, inactive, rocky body orbiting the Sun. Comet: A relatively small, at times active, object whose ices can vaporize in sunlight forming an atmosphere (coma) of dust and gas and, sometimes, a tail of dust and/or gas. read more

Blair noted that a 1000-meter-diameter asteroid in that class could provide platinum worth $690 billion, assuming complete recovery of platinum. John S. Lewis, professor of planetary science and author of Mining the Sky: Untold Riches from the Asteroids, Comets, and Planets, takes it much further. read more

This main asteroid belt holds more than 200 asteroids larger than 60 miles (100 km) in diameter. Scientists estimate the asteroid belt also contains between 1.1 million and 1.9 million asteroids larger than 1 km (3,281 feet) in diameter and millions of smaller ones. read more

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