Many asteroids are not solid, but are piles of rubble. We know because the density is (much) lower than taht of rock / iron. The desity is taken from the mass, using binary asteroids.
We also that there is a a limit on the rotational period (measured with Doppler radar) for low-mass asteroids. They would just fly apart.
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Many asteroids are not solid, but are piles of rubble. We know because the density is (much) lower than taht of rock / iron. The desity is taken from the mass, using binary asteroids.
We also that there is a a limit on the rotational period (measured with Doppler radar) for low-mass asteroids. They would just fly apart.