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Consider a space ship traveling from Earth to the nearest star system: a distance d = 4 light years away, at a speed v = 0.8c (i.e., 80% of the speed of light). To make the numbers easy, the ship is assumed to attain full speed in a negligible time upon departure (even though it would actually take about 9 months accelerating at 1 g to get up ...
In the Steady state theory the universe is infinitely old and uniform in time as well as space. There is no Big Bang in this model, but there are stars and quasars at arbitrarily great distances. The expansion of the universe causes the light from these distant stars and quasars to redshift, so that the total light flux from the sky remains finite.
The device would act as a light collector and would power the light rays deformed and curved by the gravitational depression of the black hole. The collector would then reveal the past as detailed by the photons that had originated from Earth. Since Gott believes that time travel is not cosmologically excluded, he has presented the possibility ...
Since the 17th century, astronomers and other thinkers have proposed many possible ways to resolve this paradox, but the currently accepted resolution depends in part on the Big Bang theory, and in part on the Hubble expansion: in a universe that existed for a finite amount of time, only the light of a finite number of stars has had enough time ...
The light-travel distance to the edge of the observable universe is the age of the universe times the speed of light, 13.8 billion light years. This is the distance that a photon emitted shortly after the Big Bang, such as one from the cosmic microwave background , has traveled to reach observers on Earth.
Earth may have had a ring made up of a broken asteroid over 400 million years ago, a study finds. ... Earth ring theory may shed light on an unexplained ancient climate event, scientists say.
John Dupré, in a number of papers and mainly in his paper "Natural Kinds and Biological Taxa", [7] has demonstrated that the theory of natural kinds, which many have taken to be established and/or supported by Putnam's Twin Earth thought experiment does not find support in the practice of scientific classification.
Aryabhatta puts forward the theory of rotation of the Earth in its own axis and explained day and night was caused by the diurnal rotation of the Earth. He models a geocentric universe with the sun, moon, and planets following circular and eccentric orbits with epicycles. [48] 5th century – The Jewish talmud gives an argument for finite ...