Reference Pages
07 May 2012, 09:35 AM ET
What is the North Star? And how do I find it?
04 May 2012, 02:51 PM ET
Nibiru has been linked to NASA, and is also sometimes referred to or confused with Planet X, another supposed world for which there is no evidence.
03 May 2012, 07:44 PM ET
A blue moon is not typically blue, but it can be. Find out the error that led to today's definition of blue moon and learn when is the next blue moon.
13 April 2012, 06:30 AM ET
Titan is the only moon in the solar system with a thick atmosphere. See more Titan facts here.
10 April 2012, 10:38 AM ET
Pluto, the most famous dwarf planet, lost its planet status in 2006. Learn more about dwarf planets of the solar system here.
03 April 2012, 11:15 AM ET
Learn about the science behind the northern and southern lights.
09 November 2011, 11:17 AM ET
Here's a look at all the Mars missions to date, with those that failed in bold.
26 October 2011, 01:16 PM ET
The icy dwarf planet Eris is nearly exactly the same size as Pluto.
08 April 2011, 07:00 AM ET
A look at some of the records people have set over the first 50 years of human spaceflight.
03 August 2007, 10:45 AM ET