REUTERS: NASA on Thursday selected three companies, including the space firms of Elon Musk and Jeff Bezos, to build lunar landing systems that can carry astronauts to the moon by 2024, the White House's accelerated deadline under the space agency's moon-to-Mars campaign.The three companies will share US$967 million from NASA.AdvertisementAdvertisement(Reporting by Joey Roulette; Editing by Maju Samuel)