During a recent Google Hangout, three astrophysicists discussed what we can learn about the planets in other solar systems, and answer viewers' questions about how close we are to discovering other Earths. Read a modified transcript of their discussion.
Three recently funded dark matter experiments have a good shot at glimpsing these long-sought particles. Three scientists on these projects debate the state of the hunt for dark matter, discuss the status of their experiments, and answer your questions.
Three new dark matter experiments are moving ahead with funding from the U.S. Department of Energy and the U.S. National Science Foundation — will one of them finally capture a glimpse of the universe's most elusive material?