Unknown energy source light beam and levitating rock found on Mars
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Unknown energy source light beam from the sky and levitating rock found on Mars rocky landscape, 3d illustration

"In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate." Wikipedia, The Free Encyclopedia, "Dark energy", https://en.wikipedia.org/wiki/Dark_energy
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