Universal mystery
Arguably the greatest mystery facing humanity today is the prospect that 75% of the universe is made up of a [blank] known as "dark energy", about which we have almost no knowledge at all. Since a further 21% of the universe is made from invisible "dark matter" that can only be [blank] through its gravitational effects, the ordinary matter and energy making up the Earth, planets and stars is apparently only a tiny part of what exists. These [blank] require a shift in our perception, as great as that made after Copernicus's [blank] that the Earth moves around the Sun.
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