Photo: Dark Matter's Rival: Ether Theory Challenges "Invisible Mass"

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The Black Eye galaxy is seen in this Hubble Space Telescope image released in 2004.

Last month scientists announced proof of dark matter—the prevailing scientific explanation for an otherwise inexplicable phenomenon: Galaxies behave as if they contain much more mass than is visible to astronomers.

But a Case Western Reserve University scientist is challenging the announcement with his own theory: The long-discredited substance known as ether is actually what influences gravity in the cosmos.

Image courtesy NASA and the Hubble Heritage Team (AURA/STScI)

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