On May 20, 1990, the Hubble Space Telescope sent its first image to Earth. This photo turned out to be 50% sharper than images from ground-based telescopes. In August of that year, Hubble made one of ...

Stellar black holes form when massive stars collapse after death. They usually weigh between three and fifty times the Sun.

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Sagittarius unveils stellar wonders, from the Lagoon and Trifid Nebulae showcasing the Milky Way’s breathtaking cycle of ...

Planetary nebulae, formed when red giant stars exhaust their fuel, can sometimes be spectacular (see the Hourglass Nebula) ...