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Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets.
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The concept of an expanding universe was scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
The rapid expansion of space meant that elementary particles remaining from the grand unification epoch were now distributed very thinly across the universe. However, the huge potential energy of the inflaton field was released at the end of the inflationary epoch, as the inflaton field decayed into other particles, known as "reheating".
The success of astronomy, compared to other sciences, was achieved because of several reasons. Astronomy was the first science to have a mathematical foundation and have sophisticated procedures such as using armillary spheres and quadrants. This provided a solid base for collecting and verifying data.
Moons have come to exist around most planets and many other Solar System bodies. These natural satellites originated by one of three possible mechanisms: Co-formation from a circumplanetary disc (only in the cases of the giant planets); Formation from impact debris (given a large enough impact at a shallow angle); and; Capture of a passing object.
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A security guard examines the new sign near the entrance to the Lewis Research Center one day after the National Aeronautics and Space Administration (NASA) was officially established. NASA came into being on October 1, 1958, and the National Advisory Committee for Aeronautics ( NACA ) Lewis Flight Propulsion Laboratory became the NASA Lewis ...
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