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The interval between two successive perigee passages of the Moon.
Industry:Astronomy
1) A period of time based on the revolution of the Earth around the Sun, where a year is defined as the mean interval between successive passages of the Earth through perihelion.
2) The interval between two successive perihelion passages of Earth.
Industry:Astronomy
The direction in the sky away from which the Sun seems to be moving (at a speed of 19.4 km s-1) relative to general field stars in the Galaxy.
Industry:Astronomy
The weak form of the anthropic principle states that life can exist only during a brief period of the history of our universe. The strong form of the principle states that out of all possible values for the fundamental constants of nature and the initial conditions of the universe, only a small fraction could allow life to form at all, at anytime. (See boundary conditions; fundamental constants of nature..)
Industry:Astronomy
The projection of human attributes onto nonhuman entities such as animals, the planets, or the universe as a whole.
Industry:Astronomy
1) The direction of the sky opposite to that of the galactic center.
2) The point in the galactic plane that lies directly opposite the galactic center. Here we gaze toward the edge of the Galactic disk. The nearest bright star to the anticenter is El Nath, in the constellation Taurus.
Industry:Astronomy
metalloid element with three forms. The metallic form is the more stable and is bright, silvery, hard and brittle
Industry:Astronomy
The antiparticle of a neutron. A neutron and antineutron both have the same mass and zero electric charge, but can be differentiated by their interactions: a neutron and an antineutron can annihilate into gamma rays, while two neutrons cannot.
Industry:Astronomy
