That’s a double gravitational lens. Double gravitational lensing could help scientists better understand dark energy and the expansion of the universe, because, in theory, an expanding ...

Most of them are solitary. In this new work, we show how to effectively double the number of pulsars we can use to constrain dark matter in the galaxy by rigorously using solitary pulsars to ...

Rosalind Franklin made a crucial contribution to the discovery of the double helix structure of DNA, but some would say she got a raw deal. Biographer Brenda Maddox called her the "Dark Lady of ...