Reference Pages
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.
28 June 2011, 01:38 PM ET
Vesta is the second largest asteroid in the solar system.
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.
15 November 2010, 01:10 PM ET
The sun is at the heart of our solar system and is the largest object – about 109 times the diameter of Earth. offers an overview of the sun, including its formation, evolution and orbit.
15 November 2010, 01:06 PM ET
Stars are giant, luminous spheres of plasma. offers an overview of stars, including their formation, observation, classification and naming designations.
15 November 2010, 12:59 PM ET
The sun is at the heart of our solar system and 8 planets orbit the sun. Also part of the solar system is the asteroid belt, trans-neptunian region and dwarf planets. Learn more at
15 November 2010, 12:49 PM ET
Earth is the only planet known to support life. Learn about Earth science facts and the planet’s interior composition, surface and atmosphere.
15 November 2010, 12:46 PM ET
Comets are icy bodies that release gas or dust. offers an overview of comets including physical characteristics, comet formation, collisions and more.
11 November 2010, 11:25 AM ET
Saturn is the sixth planet from the sun and the second largest.
09 November 2010, 02:04 PM ET
The Gas Giant is the Third Largest Planet
09 November 2010, 11:23 AM ET
The Eighth Planet is an Ice Giant
05 November 2010, 11:40 AM ET
Facts about our solar system’s smallest planet and closest planet to the sun.
20 October 2010, 04:59 PM ET
The giant planet with a lot of gas.
04 May 2009, 08:44 AM ET
When stars can't handle their nuclear fuel, they explode in a brilliant burst of light.
03 August 2007, 10:45 AM ET