Porosity of the moon's crust reveals bombardment history

Around 4.4 billion years ago, the early solar system resembled a game of space rock dodgeball

massive asteroids and comets, and, later, smaller rocks and galactic debris pummeled the moon and other infant terrestrial bodies

 On the moon, this tumultuous time left behind a heavily cratered face, and a cracked and porous crust.

MIT scientists have found that the porosity of the moon's crust, reaching well beneath the surface,

Scientists have assumed that a continuous onslaught of impacts would slowly build up porosity.

 the team found that nearly all the moon's porosity formed rapidly with these massive imapcts, 

the researchers also estimated that the moon experienced double the number of impacts as can be seen on the surface.

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