Nightly News | November 25, 2013
>> reporter: all eyes at nasa are on the skies because of a coet met coming for its final turn around the sun. if it survives that part of the trip we are in for a spectacular show in the night sky . it is the comet ison and astronomers say it can trace life back to the beginning of time. already visible through telescopes and binoculars, if it survives the slingshot around the sun it will be visible to the naked kwie as a bright but dirty snowball in the predawn sky in the days approaching christmas. we'll track it and we'll let you know.