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Hace 20 horas · The Doctor is the protagonist of the long-running BBC science fiction television series Doctor Who.They are an extraterrestrial Time Lord who travels the universe in a time travelling spaceship, called the TARDIS, often with companions.Since the show's inception in 1963, the character has been portrayed by fourteen lead actors. The transition to each succeeding actor is explained within the ...
Hace 20 horas · The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe.It is a remnant that provides an important source of data on the primordial universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark.However, a sufficiently sensitive radio telescope detects a faint background glow ...
