future

  Li-Fi   (also written as   LiFi ) is a  wireless communication    technology which utilizes light to transmit data and position between devices. The term was first introduced by  Harald haas    during a 2011  TEDGlobal   talk in  Edinburgh.  In technical terms, Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible , light. ultraviolet and infrared  spectrums. In its present state, only LED lamps  can be used for the transmission of data in visible light. In terms of its end use , the technology is similar to Wi-Fi — the key technical difference being that Wi-Fi uses radio frequency to induce a voltage in an antenna to transmit data, whereas Li-Fi uses the modulation of light intensity to transmit data. Li-Fi can theoretically transmit at speeds of up to 100 Gbit/s. Li-Fi's ability to safely function in areas otherwise s...

  The scientists have been made many significant discoveries to know about the origin of the universe, but they are still unsure about it. There are many theories which have explained the birth process of the universe. Well, now one new theory has been added to the list of existing theories. As per the new research, the universe has formed in the wind-blown bubbles around a giant, long-dead star which was 40-50 times the size of the sun. The new theory named as the Bubble theory was formulated by the scientists of the University of Chicago. The theory states that the solar system formed billions of years ago near a supernova. The Bubble Theory arises from the nature of cosmic inflation, which views the universe having expanded exponentially in the first tiny fraction of a second after the Big Bang. In this scenario of the ‘multiverse’ concept, some parts of space-time expanded faster than others. This created ‘bubbles’ of space-time. Each bubble contained a...

  When we were kids, we were amazed that Superman could travel faster than a speeding bullet. We could even picture him, chasing down a projectile fired from a weapon, his right arm outstretched, his cape rippling behind him. If he traveled at half the bullet's speed, the rate at which the bullet moved away from him would halve. If he did indeed travel faster than the bullet, he would overtake it and lead the way. Go, Superman! In other words, Superman's aerial antics obeyed Newton's views of space and time  : that the positions and motions of objects in space should all be measurable relative to an absolute, nonmoving frame of reference. In the early 1900s, scientists held firm to the Newtonian view of the world. Then a German-born mathematician and physicist by the name of Albert Einstein came along and changed everything. In 1905, Einstein published his theory of special relativity, which put forth a startling idea: There is no preferred frame of reference. Everything, e...

  Early recorded examples of the idea of infinite worlds existed in the philosophy of Ancient Greek  Atomism,   which proposed that infinite parallel worlds arose from the collision of atoms. In the third century BCE, the philosopher  Chrysippus    suggested that the world eternally expired and regenerated, effectively suggesting the existence of multiple universes across time.   The concept of multiple universes became more defined in the  Middle Ages .  In Dublin in 1952, Erwin schrodinger gave a lecture in which he jocularly warned his audience that what he was about to say might "seem lunatic". He said that when his equations seemed to describe several different histories, these were "not alternatives, but all really happen simultaneously". This sort of duality is called "superposition ". The American philosopher and psychologist William James  used the term "multiverse" in 1895, but in a different context. The ...

  Oxygen is the lifeline of a human being. It is the main catalyst for intracellular energy that is necessary to sustain human life. We inhale oxygen and exhale carbon dioxide. But have you ever thought that what would happen if the world lost the oxygen for just five seconds? What would we do? Would we just hold our breath for five seconds? And what would happen to the atmosphere? How will the loss of oxygen affect the environment? Okay! now take a deep breath to feel how satisfying it is before we tell you what would happen if the world lost oxygen for five seconds. The oxygen we breathe to live roughly makes up 21 per cent of our atmosphere with the 78 per cent being nitrogen and one per cent carbon dioxide and other gases. Although oxygen is not the most abundant gas in our atmosphere, it is the most important and not just for humans but for plants and other living beings as well. Without oxygen, plants, animals, water and we humans wouldn’t be alive. Though five...

The  Big Crunch  is a hypothetical scenario for the ultimate fate of the universe  , in which the expansion of the universe   eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor   to reach zero, an event potentially followed by a reformation of the universe starting with another Big bang  . The vast majority of evidence indicates that this theory is not correct. Instead, astronomical observations show that the expansion of the universe is accelerating  , rather than being slowed by gravity , suggesting that the universe is far more likely to end in heat death  or a Big Rip . The Big Crunch scenario hypothesized that the density of matter throughout the universe is sufficiently high that gravitational attraction will overcome the expansion which began with the Big Bang. The FLRW   cosmology  can predict whether the expansion will eventually sto...

  The   Andromeda Galaxy   , also known as   Messier 31 ,   M31 , or   NGC 224   and originally the   Andromeda Nebula   (see below), is a  Barred spiral galaxy    approximately 2.5 million  light-years   (770  Kiloparsecs ) from Earth and the nearest large galaxy to the  Milky way .   The galaxy's name stems from the area of Earth's sky in which it appears, the Constellation of Andromeda    , which itself is named after the  Ethiopian (or Phoenicia)   who was the wife of  Perseus in Greek mythology  .  The virial masses of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar masses (2.0 × 10 42  kilograms). The mass of either galaxy is difficult to estimate with any accuracy, but it was long thought that the Andromeda Galaxy is more massive than the Milky Way by a margin of some 25% to 50%. This has been called...