A panel of physicists and astronomers will preview emerging theories and experiments aimed at solving the mystery of dark energy, an invisible force that dominates the universe, from 1:45 to 4:45 p.m. Friday, Feb. 18, at the annual meeting of the American Association for the Advancement of Science in Washington, D.C. The discussion will take place in the Omni Shoreham Hotel Diplomat Room on the lobby level.