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 Is there a plan to retrieve the Hubble Space Telescope from space to preserve it in the Smithsonian Institution or elsewhere for future generations to appreciate?
