:ZERO SCIENTIST:

    F rom Einstein's famous equation E=mc2, we can measure the speed of light by putting the energy value and mass value in the equation. But that's just a theoretical process, practically it is not possible or it will not supply the correct value of speed of light. But in the field of practical physics, we have three methods proposed by HIPPOLYTE FIZEAU , LEON FOUCAULT and ALBERT A. MICHELSON . Now we will see how they measured the speed of light. METHOD 1: FIZEAU METHOD The first measurement of the speed of light from purely terrestrial experiments was reported by the French physicist  HIPPOLYTE FIZEAU in 1849.              Fizeau's experiment is illustrated below. A light  source was focused through a beamsplitter onto an image plane where a spinning toothed wheel was located. The light  passing between teeth of that wheel was then projected to a mirror  at a distance of about 8 km, where it was collected and then reflected back to the point of origin. The rotational s

        Gravastar is an unconventional idea that is as interesting as it is odd. This hypothesis was originally put forward by Mazur and Mottola in 2004. Gravastar literally means " Gravitational Vacuum Condensate Star ," which is (in theory) an extension of the Bose-Einstein Condensate and put forward as a part of gravitational systems. Ultimately, it is meant to stand as an alternative to black holes.        One of the benefits of the Gravastar over that if an ordinary black hole is that of entropy, the current accepted models of black holes have them having a very large entropy value. Gravastars, on the other hand, have quite a low entropy.        The theory goes that, as a star collapses further [past the point of neutron degeneracy ] the particles fall into a Bose-Einstein state where the entire star [all of the collapsing material] nears absolute zero and is able to get very compact. As a result, it acts as a giant atom composed of bosons.

The solar system is the name given to the planetary system of which the Earth is a part. It comprises planets, moons, comets, meteors and asteroids which are all held together by the gravitational pull of a star, named either the Sun or Sol.          The solar system is believed to have formed from one nebula, the solar nebula . As gravity forced the nebula to condense it became more dense and pressure inside it increased, resulting in the creation of a proto-star, which began heating up to form the sun we see today. The proto-star would have been surrounded by interstellar dust and gases which began clumping together as a result of gravity. This process continued until, about 4.6 billion years ago , the clumps of rock and gas became much larger, and eventually gravity forced these irregular-shaped objects into the globular-shaped planets we see today. Many of the rocks did not become large enough to form planets and either remain today as asteroids, or they collided with