A researcher at the Harvard Center for Astrophysics, Roy Gould gives the first public demo of the World Wide Telescope, a powerful new web-based tool for exploring the universe, developed by TEDster Curtis Wong and his team at Microsoft.
Joel Levine studies the atmospheres of Earth and Mars, looking at their origin, evolution, structure and chemistry and climate change. He's the principal investigator of the proposed ARES Mars Airplane Mission.
Stephen Hawking's scientific investigations have shed light on the origins of the cosmos, the nature of time and the ultimate fate of the universe. His bestselling books for a general audience have given an appreciation of physics to millions.
Patricia Burchat studies the structure and distribution of dark matter and dark energy. These mysterious ingredients can't be measured in conventional ways, yet form a quarter of the mass of our universe.
With Freeman Dyson's astonishing forecasts for the future, it's hard to tell where science ends and science fiction begins. But far from being a wild-eyed visionary, Dyson is a clear and sober thinker -- and one not afraid of controversy or heresy.
Curtis Wong is manager of Next Media Research for Microsoft, whose focus "spans the linear and interactive media spectrum from television, broadband and gaming to emerging media forms." He's a leader on the WorldWide Telescope project.
Oxford's newest science ambassador Marcus du Sautoy is also author of The Times' Sexy Maths column. He'll take you footballing with prime numbers, whopping symmetry groups, higher dimensions and other brow-furrowers.
Astrophysicist, cosmologist and Nobel Prize winner George Smoot studies the cosmic microwave background radiation -- the afterglow of the Big Bang. His pioneering research into deep space and time is uncovering the structure of the universe itself.
Brian Greene is perhaps the best-known proponent of superstring theory, the idea that minuscule strands of energy vibrating in a higher dimensional space-time create every particle and force in the universe.