The temperature changes hour to hour and day to day; exchange rates behave no differently. Wherever studies of the ...

Using the Cerro Tololo Inter-American Observatory (CTIO), an international team of astronomers have performed deep optical ...

Surrounded by glowing discs of swirling gas, quasars emit immense light that can be seen across vast cosmic distances.

Using the aging Hubble Space Telescope, Achenbach spotted an unusual spiral galaxy quasar with a visible jet. This calls into ...

Tattoo designs with bold and expressive brushstrokes add an abstract symbol ... uses varying shades of black ink to create ...