A solar cell is an electronic device that directly converts sunlight into electricity. Light shining on solar cells produce both current and voltage.
The Big Bang Theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution.
The steady-state model was proposed by three physicists in 1948, Hermann Bondi, Thomas Gold, and Fred Hoyle to explain the structure and working of Universe.
Spectroscopic parallax is an astronomical method for measuring the distances to stars. It can be applied to any main sequence stars for which a spectrum can be recorded.
Radio astronomy is the sub-field of astronomy that studies celestial objects at radio frequencies. It was first used in 1932.
Visible light astronomy encompasses a wide variety of observations via telescopes that are sensitive to the range of visible light.
Historically, two basic scenarios of the origin of the Solar System have been discussed. In one, the Solar System formed as a byproduct of the Sun’s formation.
When a main-sequence star has consumed the hydrogen the loss of energy generation causes gravitational collapse and star evolves off the main sequence.
In 1934, Walter Baade and Fritz Zwicky suggested that Supernovae involve a collapse of a massive star, resulting in a neutron star.
Two Energy sources are available to stars: Gravitational Contraction (Kelvin-Helmholtz) and Nuclear Fusion in the hot core.