Cosmology

The hunt for these mysterious “missing-matter” substances has now taken a leap forward, thanks to two new lab experiments

A hundred years on, and the implications of Einstein's general relativity still surprise and delight

Research reveals today's produced energy is only about half of what it was 2 billion years ago

Private funding for the Arecibo Observatory—the largest single-dish radio telescope in the world—may be a poison pill

With a $100-million donation, billionaire Yuri Milner plans to revolutionize the astronomical quest to find alien life

Entrepreneur and former physicist Yuri Milner talks about the just-announced $100-million Breakthrough Listen Project to search for extraterrestrial technological civilizations

NASA chooses astronauts to fly on commercial missions

Astronomers have discovered more than 800 so-called "ultradiffuse galaxies" that are virtually invisible because they have relatively few stars and are mostly dark matter. Clara Moskowitz reports

As the legendary space telescope enters its twilight years, astronomers are searching for a replacement, but no one agrees about what it should accomplish

General relativity and Noether’s theorem take center stage in two live Web broadcasts this week

A bright galaxy may hold starts from a generation that seeded the rest of the universe

NASA’s former director of astrophysics plans to revolutionize space science with agile, privately funded missions