A theoretical particle that adapts to its surroundings could explain the accelerating expansion of our universe.
A puzzling mismatch is forcing astronomers to re-think how well they understand the expansion of the universe.
See cosmologist Risa Wechsler's answers to readers' questions about dark matter and dark energy.
How do scientists know what percentages of the universe are made up of dark matter and dark energy?
Next-generation telescopic surveys will work hand-in-hand with supercomputers to study the nature of dark energy.
Physicist Jim Pivarski explains ways to think about the expansion of space.
Exploding stars have an immense capacity to destroy—and create.
Scientist Marcelle Soares-Santos talks about Brazil, neutron stars and a love of discovery.