Sky History2 Aliens And The Red Planet: Experts question what probes on Mars may have found over the past 40 years. Could NASA be hiding proof of life on the Red Planet from the public? (S6, ep 8) 2026-04-01 Mars: The New Frontier: With science closer than ever to proving that life once lived on Mars, is there a chance that something still exists there? (S4, ep 17) 2026-04-01 Alien Communications: With light from distant stars taking millions of years to reach us, how long might it take for alien life to answer any communication sent into space? (S4, ep 18) 2026-04-01 Gloucestershire: Andy receives military training at a Civil War re-enactment, before embarking on a ghostly hunt and meeting the man who captured leopard DNA from a sheep kill. (S1, ep 7) 2026-04-01 West: Alice Roberts and Matt Williams visit sites in the west of Britain, including one uncovering the rituals of Stonehenge. (S4, ep 1) 2026-04-01 Experts investigate whether centuries-old paintings of aliens and UFOs are artistic renderings of real sightings, a coded message for humankind, or just a coincidence. (S1, ep 21) 2026-04-01 Experts investigate if a series of house fires across the UK are linked to an allegedly cursed portrait. (S1, ep 22) 2026-04-01 Sea Lions, Voynich Manuscript, Cocaine Mummies: A look at a mysterious medieval manuscript and Egyptian mummies containing cocaine from Peru. (S1, ep 3) 2026-04-02