Scientists have discovered the chemical compound uracil, one of the building blocks of RNA, in just 10 milligrammes of material from the asteroid Ryugu, according to new research published on Tuesday. The finding lends weight to a longstanding theory that life on Earth may have been seeded from outer space when asteroids crashed into our planet carrying fundamental elements. Yoshinori Takano, a scientist at the Japan Agency for Marine-Earth Science and Technology and author of the Ryugu research, said he was also keenly awaiting the Martian Moons eXploration project, set to launch from Japan next year and return around 2029