Could this be a UFO, a Stargate, or a more terrestrial explanation?
My favorite and one I would like to believe is that it is a Stargate. Could you imagine if ETs were coming here on a spacebridge of sorts? The technology they could share with us, or like many of the movies and shows lately, how quickly they could over run our planet with stargate technology.
The most likely explanation is that of a U.S. Minuteman III balistic missile going through one of it's stages as it entered or left the atmosphere. The government should have the answer for that.
Irregardless of the cause, it shows that we have our eyes to the skies more now than ever. It makes me wonder what kind of great sightings we will have over the next few months and years. Will we get 'real' footage of UFOs? Spot great asteroids and comets as they pass by our planet? Maybe prove the existence of the Earth's Dark Twin? Only time will tell and I will have my eyes to the skies until then.