Nation/World

Asteroid 2011 MD

• Flew close to Earth in 201 1.

• Was examined by telescopes on Earth and the Spitzer Space Telescope.

• Probably weighs around 100 tons, according to researchers.

• Is so porous that about two-thirds is empty space and one-third is rock.

• The robotic cost of the mission would be about $1.2 billion.



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