Science today spans the accidental, the engineered and the ecological. On the Moon, scientists are awaiting confirmation that a discarded SpaceX Falcon 9 upper stage, after drifting for months in an unstable orbit, has slammed into the lunar surface near Einstein Crater at roughly 5,400 miles an hour—an unintended collision that may still offer researchers a rare chance to study fresh crater formation. Back on Earth, gene-editing researchers say they have created beagles whose saliva and hair lack a key allergy-triggering protein, raising the prospect of dogs that are easier for some allergy sufferers to live with, though big questions remain about safety, regulation and broader effectiveness. And in the natural world, a sweeping global study finds climate change is reshaping butterfly ranges across continents, with many species moving poleward or uphill in search of cooler habitats. Meanwhile, a 6.3 earthquake struck off the southern Philippines, with no tsunami warning issued.