The new film "Noah" stars Russell Crowe as the man chosen by God to collect pairs of Earth's animals on a massive ark to save them from a global flood. The film, which opened March 28, is sizing up to be a Biblical blockbuster, replete with star power and stunning special effects. But how realistic is it?

While many people consider the story of Noah's Ark merely an instructive myth or parable about God's punishment for man's wickedness, others believe that the story is historically accurate. To them, Noah's tale describes events that really happened only a few thousand years ago.

Henry Morris, author of "The Biblical Basis for Modern Science" (Baker House, 1984), a creationist text, states that "The ark was to be essentially a huge box designed essentially for stability in the waters of the Flood rather than for movement through the waters. ... The ark was taller than a normal three-story building and about one and a half times as long as a football field. The total volumetric capacity was equal to 1,396,000 cubic feet [39,500 cubic meters] ... equivalent to 522 standard railroad stock cars, far more than enough space to carry two of every known kind of animal, living or extinct." [Wipeout: History's Most Mysterious Extinctions]

The flaws in Morris's calculations become evident when you consider that, according to many creationists, Noah's Ark included hundreds of dinosaurs. That would mean, for example, the brachiosaurus (two of them, of course), each of which weighed about 50 tons and reached 85 feet (26 meters) long. Even if two representatives all of Earth's animals could somehow fit on the ark, enough space would be needed for drinking water and food for an entire year.

Furthermore, contrary to many depictions of the ark, God actually asked Noah to collect not one but seven pairs of "clean" animals and one pair of "unclean" animals (Genesis 7:2-3) — resulting, in some cases, in fourteen of many animals. There simply would not be nearly enough space for all of them.

There's also the problem of collecting all those animals in the first place, anthropology professor Ken Feder notes in his book "The Encyclopedia of Dubious Archaeology" (Greenwood, 2010).

"How would koala bears from Australia, llamas from South America and penguins from Antarctica have managed the trip to the ark's location in the Middle East?" Feder writes. "And how would their human caretakers have looked after this vast menagerie of animals? Noah, his wife, and his three sons and their wives (that's only eight people) providing food and water to the animals would have been an impossible task. What (or who) would the carnivores, living in close quarters with all those delicious herbivores, have eaten?"

Since the ark's purpose was merely to float (and not necessarily go anywhere), it would have had no means of propulsion (such as a sail) or even steering. According to Morris, "As far as navigation was concerned, God Himself evidently steered the ship, keeping its occupants reasonably comfortable inside while the storms and waves raged outside." [History's 10 Most Overlooked Mysteries]

Of course, this rather begs the question, because if God created the global flood and divinely steered the ark, then presumably He could have done any other miracle to assure the success of Noah's mission, from temporarily shrinking all the animals to the size of rats or even allowing them all to live for a year without food or water. Once a supernatural miracle is invoked to explain one thing, it can be used to explain everything.

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