NOAA forecasters are also estimating a 30% to 45% chance of polar geomagnetic storms on January 17, 2013 when a CME is expected to hit Earth's magnetic field.
This final, breathtaking footage from the successful GRAIL moon mission was taken just six miles (10 kilometers) above the moon's surface on December 14, 2012.
At present, there's a remote chance that Apophis will strike us in 2036. It's expected to drop to zero after the early 2013 pass of Apophis near Earth.
Could life survive on a world whose orbit around a distant sun was extremely oblong and eccentric? Such a world would have periods of extreme heat and cold.
A survey of 18 giant black holes shows that at least ten may weigh between 10 and 40 billion times the mass of the sun. Astronomers have dubbed these "ultramassive" black holes.