Image: Tatooine
Reuters file
R2-D2, C-3PO, Padm√© Amidala and Anakin Skywalker (portrayed by Natalie Portman and Hayden Christensen) walk the sands of Tatooine in "Star Wars, Episode II: Attack of the Clones." Could planets like Tatooine exist in double-star systems?
updated 11/23/2004 4:14:29 PM ET 2004-11-23T21:14:29

Science speeds along so fast that it can be hard sometimes to know exactly what's known. So every now and then, it's helpful to pause and ponder the state of things.

The following 10 statements straddle the line between fact and fiction in space science. If you haven't been paying very close attention, the truthfulness of some might be hard to gauge.

After you've submitted your answers for scoring, follow the Web links to learn more about science fact and fiction from

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