The Big Bang Theory explains how the universe began with an infinitely hot and dense single point that inflated to form the ever-expanding cosmos we see today.
09 May 2021, 08:05 am
Multiverse is very popular concept in various sci-fi films. One of these is Marvel s Doctor Strange, which shows that the universe is not alone.
However, some scientists claimed that the multiverse really does exists.
(Photo : Photo by Hubble Space Telescope/Nasa via Getty Images)
In this handout image released from the Hubble Space Telescope the Whirlpool Galaxy is seen , April 25, 2005 released for the Hubble 15th anniversary. Nasa s Space Telescope has obited the Earth for 15 years and has taken more than 700,000 images of the comos. This image is one of the sharpest images Hubble has ever produced, taken with the newest camera.
Finding Light in Dark Atomic Clouds
May 10, 2021•
Physics 14, 69
Researchers have prepared and manipulated subradiant states in which collective effects slow down the decay of excited atoms in a dense atomic cloud.
Figure 1: (Left) An atom in an excited state eventually unavoidably decays to its ground state, releasing a photon. (Right) In a collection of excited atoms separated by less than the transition wavelength, destructive interference in their photon emission prevents their collective decay from the excited state (
e) to the ground state (
g).(Left) An atom in an excited state eventually unavoidably decays to its ground state, releasing a photon. (Right) In a collection of excited atoms separated by less than the transition wavelength, destructive interference in their photon emission pre. Show more
Black holes are prisons of light. They are both metaphor and physical entity, mute commentary on what is known, unknown, and unknowable. Well-studied but poorly understood, like a virus.
What happens gravitationally if you squeeze the mass of an object to a point? This was Karl Schwarzschild’s question while stationed at the Russian front of the First World War. You get a point of no volume and infinite density a singularity. It would be surrounded by a region where nothing, not even light, could escape. This boundary became known as the event horizon because no event within the boundary could be observed from outside.