Ares I-X: NASA's New Rocket Versus Tallest Rockets EVER (PHOTOS, POLL)

As NASA prepares for the launch of its lofty new Ares I-X rocket, we decided to take a look back at the biggest rockets of years' past.

See how NASA's Ares I-X stacks up to the world's tallest rockets -- past, present, and possibly future -- and don't forget to vote for your favorite!

Read more about the Ares I-X launch and see more photos of it here.

Saturn V

NASA's 363 foot Saturn V was a three-stage booster used to send American astronauts to moon in the late 1960s and early 1970s. Although the last one launched in 1973, it reportedly remains the largest and most powerful launch vehicle that was operational. It weighed 6.5 million pounds (the Ares I-X, by contrast, weighs 1.8 million pounds).

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