SpaceCould a huge lunar telescope be our best chance of spotting aliens? In this latest instalment of Future Chronicles, an imagined history of future inventions, Rowan Hooper explores the advances that meant an optical telescope with an effective mirror size of 3000 km could be built on the moon Comment
PhysicsWhat happens to light's energy when it redshifts? It's complicated When it comes to cosmology, answering one question only leads to more. Just take light. Chanda Prescod-Weinstein dives into a reader's question Comment