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The layers of the Earth, a differentiated planetary body. In planetary science, planetary differentiation is the process by which the chemical elements of a planetary body accumulate in different areas of that body, due to their physical or chemical behavior (e.g. density and chemical affinities).
An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet ... Internal differentiation of large asteroids is possibly related to ...
Its density is low (around 1.4 times the density of water), indicating that the asteroid is porous; best-fit models estimate it had an original composition by volume of 35% rock, 13% ice and 52% internal voids, and that today it consists of a pristine anhydrous outer layer, and a differentiated interior, with meltwater having percolated inward ...
Bennu’s parent asteroid, which formed around 4.5 billion years ago, seems to have been home to pockets of liquid water. The new findings indicate that water evaporated and left behind brines ...
In 2022, NASA launched the Double Asteroid Redirection Test (DART) spacecraft, whose sole goal was to fly 7 million miles to the 525-foot asteroid Dimorphos, and crash into it at 14,000 miles per ...
The interior of the planet begins to differentiate by density, with higher density materials sinking toward the core. [23] Smaller terrestrial planets lose most of their atmospheres because of this accretion, but the lost gases can be replaced by outgassing from the mantle and from the subsequent impact of comets [ 24 ] (smaller planets will ...
The new class of O-type asteroids has since only been assigned to the asteroid 3628 Božněmcová. A significant number of small asteroids were found to fall in the Q, R, and V types, which were represented by only a single body in the Tholen scheme. In the Bus and Binzel SMASS scheme only a single type was assigned to any particular asteroid.
These asteroid parent bodies of chondrites are (or were) small to medium-sized asteroids that were never part of any body large enough to undergo melting and planetary differentiation. Dating using 206 Pb/ 204 Pb gives an estimated age of 4,566.6 ± 1.0 Ma, [6] matching ages for other chronometers.