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What are Saturn's rings made of?
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What are Saturn's rings made of. Learn about Saturn's six main rings, what Saturn's rings are made of and how Saturn's rings were named.
Do the Planets Ever Actually Align?
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Full planet alignment in our solar system is mostly hypothetical. The eight major planets only meet in a single line once every 13.4 trillion years, roughly.
10 Cool Things About Carl Sagan
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He is famous for a phrase he never said, for wearing turtlenecks and for hosting the original 'Cosmos' TV series. As enthusiastic about the stars as he was about marijuana, Carl Sagan led a very surprising life.
How are the Voyager spacecraft able to transmit radio messages so far?
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The Voyager spacecraft use 23-watt radios. This is higher than the 3 watts a typical cell phone uses, but in the grand scheme of things it is still a low-power transmitter. The key to receiving the signals is therefore not the power of the radio, but a combination of three other things.
The Fuel Efficiency of Military Vehicles Quiz
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Armed conflict consumes unimaginable amounts of gasoline and diesel fuel. How much do you know about the fuel efficiency of war machines? Take this quiz to find out.
Exploring Jovian Planets, the Titans of Our Solar System
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The four Jovian planets are officially designated as gas (and/or ice) giants. Which planets are they and what makes them so unique?
What Really Happened to Yuri Gagarin, the First Man in Space?
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He stood just 5 feet, 2 inches. But Gagarin cast an enormously long shadow in space exploration, both for his achievements and his mysterious death.
Off to the New World: The Christopher Columbus Quiz
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Whether you consider him a visionary explorer or a barbaric invader, there's no doubt that Christopher Columbus was a fascinating guy. How much do you know about the explorer and his many voyages? Take this quiz to find out.
Bon Voyage! The Cruise Quiz
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The Ultimate Cruise Quiz tests what you know about cruise ships and cruise vacations. How many cruise questions can you answer? Take the cruise quiz.
Is there really a face on Mars?
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The face on Mars stunned observers in the 1970s. Learn if this formation is the colossus of a human face or simply an interesting rock formation.