... What you are seeing, most likely, is a spacecraft in low Earth orbit reflecting back sunlight as it circles the Earth once every 90 minutes or so. Two of the brighter spacecraft in the present day sky are the International Space Station (ISS), and, when it is up, a NASA space shuttle. ... These lights were were the ISS and the space shuttle Discovery , which had undocked from the ISS a few hours earlier. ... Publications with keywords: international space station - ISS - space shuttle Discovery . ...