Quizzes
25 July 2012, 04:00 AM ET
See how much you know about the dwarf planet Pluto and its natural satellites.
24 July 2012, 04:00 AM ET
Test your knowledge of the satellites around Earth in this quiz about our planet's artificial satellites.
23 July 2012, 08:02 AM ET
Find out your animal-sex IQ ...
23 July 2012, 04:00 AM ET
Do you know your Schwarzschild radius from your Chandrasekhar limit? Find out here.
20 July 2012, 04:00 AM ET
Test your knowledge of Earth's closest star.
18 July 2012, 04:00 AM ET
Brain-teasers about the private space firm and its Dragon capsule.
10 July 2012, 04:00 AM ET
Test your knowledge of these leftovers from the solar system's birth.
05 July 2012, 04:00 AM ET
Find out how much you know about some of the goofiest Mars claims.
03 July 2012, 10:14 AM ET
27 June 2012, 04:00 AM ET
If you know your moon facts, this quiz should be easy.
22 June 2012, 01:19 PM ET
How much do you know about one of the most famous and mystical stone structures?
22 June 2012, 01:00 PM ET
How well do you know Earth's nearest star?
22 June 2012, 04:00 AM ET
How well do you know your shooting star facts?
19 June 2012, 04:00 AM ET
Find out by taking our really easy quiz.
14 June 2012, 04:00 AM ET
Space Shuttle Countdown
11 June 2012, 04:00 AM ET
07 June 2012, 04:00 AM ET
How well do you understand weather and our climate and the difference between them?
06 June 2012, 04:00 AM ET
Take our quiz on the reusable space plane. How much do you know?
01 June 2012, 04:00 AM ET
October 4, 2007 marks the 50th anniversary of the launch of the manmade satellite. How well do you remember the past half-century in space? Take this 10-question quiz and test your knowledge of space history.
01 June 2012, 02:00 AM ET
Test your knowledge of Venus facts.
31 May 2012, 02:00 AM ET
For most of human history, the moon spawned awe and fear, but we know a lot about it today. How much do you know?
30 May 2012, 02:00 AM ET
Do you know basic facts about the planet closest to the sun?
29 May 2012, 08:31 AM ET
As an any astronaut will tell you, life in space is a lot like life on Earthwith some very important differences. On Earth, for example, if you leave your fork floating in air while you grab for your spoon, it will quickly hit the floor.
29 May 2012, 02:00 AM ET
How much do you know about some goofy claims about Mars?
28 May 2012, 02:00 AM ET
What do you know about your home planet?
23 May 2012, 04:48 PM ET
How much do you really know about birth control?
17 May 2012, 01:53 PM ET
Prove how much you known about weather oddities.
01 May 2012, 04:45 PM ET
How much do you know about mummification and mummies?
20 April 2012, 01:00 PM ET
How much do you know about the story behind your species, Homo sapiens?
20 April 2012, 12:10 PM ET
What do you know about your home planet?
17 April 2012, 06:48 PM ET
What do you know about the mysterious creatures said to lurk in forests, lakes and oceans around the world?
10 April 2012, 03:53 PM ET
Try your hand at a little paleontology.