By Hyunjoo Jin, Raphael Satter and Munsif Vengattil WASHINGTON (Reuters) -NASA awarded billionaire entrepreneur Elon Musk's space company SpaceX a $2.9 billion contract to build a spacecraft to bring astronauts to the moon as early as 2024, the agency said on Friday, picking it over Jeff Bezos' Blue Origin and defense contractor Dynetics Inc. Bezos and Musk - the world's first and third richest people respectively, according to Forbes - were competing to lead humankind's return to the moon for the first time sine 1972