Particle astrophysics probes the most extreme environments of nature: the highest energies, the emptiest vacuum of space, the smallest times and distances, the earliest moments of time, and new forms of matter and energy that dominate the origin and evolution of the cosmos as a whole. This symposium features speakers in several areas where new experimental techniques are currently producing new results with rapid improvements in precision and/or sensitivity. Leading scientists will present results from their own projects while also providing a short survey of related results worldwide in this fast-moving field. An overview of particle astrophysics—experiments that probe new fundamental physics by using the extreme environments provided by the cosmos—and  new experimental results will be discussed, including data on showers created by the highest energy cosmic rays that give clues to their origin and composition; deep underground experiments that limit, or in some cases hint at detections of, interactions with weakly interacting cosmic dark matter particles from the halo of our galaxy; gamma ray telescopes that give a new view into the highest energy cataclysms of the cosmos, and possibly intragalactic dark matter decays and annihilations; and a new kind of experiment being developed to probe evidence of quantum behavior of space-time itself, and a minimum interval of time.