NASA asteroid-study and sample-return mission
Researchers have detected erythrulose, a four-carbon sugar, in the interstellar medium near the Milky Way’s center. The finding supports theories that sugars essential to life could form in space and arrive on Earth via comets and asteroids. The study, published in Nature Astronomy, suggests that millions of tonnes of erythrulose may have rained down on Earth during the Late Heavy Bombardment.