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A quarter of a century after detecting dark energy, scientists are still trying to figure out what it is

Astronomers use a variety of techniques and instruments — collectively referred to as the cosmic distance ladder — to measure cosmic distances because it is a difficult task.Type Ia...

After 17 years at Texas A&M, Nick Suntzeff, Ph.D., director of A&M’s astronomy program, is set to retire at the end of this semester. Students who have met him likely

"Anyone who has never made a mistake has never tried anything new." -Albert Einstein Back when Einstein first proposed his theory of General Relativity, his revolutionary picture of the Universe was met with a mix of curiosity, awe, and intense skepticism. It isn't every day that your most cherished of all physical theories -- the theory of Newtonian Gravity that had ruled the cosmos for nearly two-and-a-half centuries -- gets challenged by a newcomer.

“I must choose between despair and Energy —— I choose the latter.” -John Keats Yes, we know that the fabric of the Universe is not made up of space and time but rather a unified spacetime; that the spacetime isn't static but rather expands as the Universe goes on; and that the expansion isn't slowing down but is rather accelerating as we continue. The term we give to this phenomenon is dark energy, and we arrive at it via multiple, independent lines of evidence.