Iridium 40 Satellite Flare on March 11, 2012 as observed in Manila, Philippines. Maximum brightness occurred at 7:34:26 pm. Image taken with a Canon 450D DSLR, 50 mm set at f/5, ISO 100, 30 sec exposure. Photo credit: Anthony Urbano

Satellite flares are caused by the reflective surfaces on satellites like antennas and solar panels acting as a giant mirrors in space, reflecting sunlight directly towards the Earth,  seen from the ground as a bright “flare” that could last for a few seconds. More Iridium flare images here.