... Have you ever seen a bright halo around the Sun? Unusual halos and arcs were so bright one recent afternoon in Trier, Germany that even casual people on the street noticed them. ... What if you saw your shadow on Mars and it wasn't human? ... Tonight: A Blue Moon . ... Razorbacks in Endurance Crater . ... Over one year after its launch, robot geologist Opportunity has been spending recent sols on Mars inching its way down the slopes of Endurance crater. ... A Large Active Region Crosses the Sun . ...