The BBC has a report that evidence has been found in lunar rock samples of a planetismal (called Theia) that was thought to have crashed into the Earth to form the Moon. The conclusion is based on a difference in oxygen isotope ratios detected in lunar rock samples returned from the Apollo space missions versus terrestrial samples.
The report is published in the journal Science [abstract]; report is paywalled.
(Score: 3, Interesting) by TrumpetPower! on Saturday June 07 2014, @12:42AM
Liquidity is not required. Ever see a landslide? Even just a few pebbles rolling down a slope? That's the Earth's gravity causing the Earth to become even more spherical. Similar processes would work equally well to shape anything massive enough into something basically spherical.
b&
All but God can prove this sentence true.