BBC News' wonderful In Pictures section, including Hiroshima: Now and Then, Space Shuttle Discovery in orbit, and readers' photos of Battersea Power Station.
A beautiful photograph of Earth Some eye candy to cheer up your Friday
Puzzling X-rays from Jupiter "We weren't surprised to find x-rays coming from Jupiter." Other observatories had done that years ago. The surprise is what Chandra has revealed for the very first time: the location of the beacon -- surprisingly close the planet's pole -- and the regular way it pulses. (Via Fark.)