Cosmology Dark energy is consistently described as a property of space itself. Does this mean that, in the total absence of matter, the universe would still exist?
Stars How do globular clusters form? Can such massive concentrations of stars arise from gas clouds alone, or is a central black hole required?
Science, Solar System NASA’s Solar Dynamics Observatory investigates the Sun’s cycle of highs and lows
Human Spaceflight, Space Exploration Shuttle Atlantis headed for delivery stop at International Space Station
