Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

Origins -- Spaceship Hubble -- Hubble vision -- Planets -- Stars & nebulae -- Galaxies -- Black holes -- The dark cosmos -- Optical illusions -- Hubble's future ...

For humans, the most important star in the universe is our sun. The second-most important star is nestled inside the Andromeda galaxy. Don't go looking for it—the flickering star is 2.2 million ...

The Hubble Space Telescope has been quietly orbiting Earth for decades, but it’s still one of the most valuable tools we have ...