Today, according to NASA's satellite estimates it [the universe] consists of the following: Dark Energy 72%, Dark Matter 23%, the matter we know, including light, 4.6%. The total does not add up to 100% because there are always some uncertainties in the numbers obtained. Everything you've seen so far throughout your journeys correspondes to only 4.6% of the total content of our universe. The rest...is unknown.
-Christophe Galfard
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