An astronomer is a scientist who studies celestial objects and processes, such as stars, planets, galaxies, and the universe as a whole.

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it.

Cambridge University Press is a publishing house and part of the University of Cambridge.

The Cerro Tololo Inter-American Observatory (CTIO) is an astronomical observatory located on the summit of Mt.

The Chandra X-Ray Observatory is a space telescope launched by NASA in 1999 to observe X-rays from high-energy sources in the universe.

Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time.

Earth is the third planet from the Sun in our solar system and the only known celestial body to support life.

The European Organisation for Astronomical Research in the Southern Hemisphere, commonly referred to as the European Southern Observatory (ESO), is an intergovernmental research organisation made up of 16 member states for ground-based astronomy.