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you can’t explain how it is that the stars and galaxies are organized as they evidently areadbusters_120_black_S

If you calculate

all gravitational forces observably in play in the universe, you can’t explain how it is that the stars and galaxies are organized as they evidently are.

Something must be exerting some kind of gravitational energy to keep things in place, but what that is has eluded detection by any and all human-made instruments.

It neither gives off nor reflects any kind of electromagnetic radiation.

Yet if scientific theories are correct, there must be a shocking amount of it: only five percent of the universe is what we think of as ordinary matter.

The rest is unfathomably dark.

— Ken Johnson, New York Times, 2014