@Scietic⭐

  Gravity is a distortion in space-time, which is felt as a pull on things proportional to a combination of their energy and momentum. The source of the curvature is the stress-energy tensor and this makes no distinction between mass and energy. They are treated as related by the famous E=mc^2. When you first learn about gravity in school, you learn Newton’s law: that the force of gravity between two objects, one of mass M1 and one of mass M2, has a strength proportional to the product M1M2. { F = (GM1M2)/r^2} But that was true before Einstein. It turns out that Newton’s law needs to be revised: the Einsteinian statement of the law is (roughly) that for two objects that are slow-moving (i.e. their speed relative to one another is much less than c, the speed of light) and have energy E1 and E2, the gravitational force between them has a strength proportional to the product E1E2. How are these two statements, the Newtonian and the Einsteinian, consistent? They are consistent becaus...

  An elliptical galaxy, full of dark lanes of gas, likely formed in the merger of two other galaxies. Elliptical galaxies host less (or no) star birth than spiral galaxies like the Milky Way. (Image credit: NASA, ESA and The Hubble Heritage Team (STScI/AURA)) WHAT ARE ELLIPTICAL GALAXIES?  Elliptical galaxies are the most abundant type of galaxies found in the universe but because of their age and dim qualities, they're frequently outshone by younger, brighter collections of stars. Elliptical galaxies lack the swirling arms of their more well-known siblings, spiral galaxies. Instead, they bear the rounded shape of an ellipse, a stretched-out circle. One of the most famous elliptical galaxies is Cygnus A, which is located roughly 600 million light-years from Earth and is an extremely bright radio source. Cygnus A is not only well-known to astronomers, but has a place in science fiction; it was featured in the 1985 novel "Contact," a Carl Sagan story that later inspired a H...

 The Standard Model is a physics theory that explains how all particles and fundamental forces except gravity interact. In the 1970s, scientists realized that the accepted theories of the time predicted that elementary particles could not have mass. Except that they knew that wasn’t true; experimeThe sun helped prove Einstein right...nts had already shown that these particles did have mass. Something was missing. Three physicists (Robert Brout, François Englert, and Peter Higgs) developed a mechanism that explained this apparent conflict. This mechanism was later an essential ingredient of what is now the Standard Model of particle physics. They proposed that the Standard Model was missing a field that would interact with elementary particles and that the interaction gives these particles mass. Weinberg, Salam, and Glashow later constructed a complete theory explaining the known interactions of particles, along with their masses. This theory contained an essential ingredient – the...

https://scisujan.blogspot.com/   The first gravitational waves detected came from a binary black hole system nobody predicted! On 14 September 2015, gravitational waves were detected on Earth for the first time. These ripples in the fabric of space-time – predicted by Einstein in 1916 – came from the merger of two black holes in a distant galaxy. Briefly, the power pumped out was 50 times greater than that of all the stars in the Universe combined. But this was not the only jaw-dropping aspect of the event. Each of the black holes was in the 30 solar mass range. Since a black hole is what’s left after most of a star has blown into space as a supernova, the precursor stars must have weighed at least 300 solar masses.

 I never make the same mistake twice. I make it three four times, you know, just to be sure! I won't be impressed with technology until I can download food👽

In the twentieth century, two theoretical frameworks emerged for formulating the laws of physics. The first is Albert Einstein's general theory of relativity, a theory that explains the force of gravity and the structure of space and time .   The other is quantum mechanics which is a completely different formulation to describe physical phenomena using the known probability principles. By the late 1970s, these two frameworks had proven to be sufficient to explain most of the observed features of the universe, from elementary particles to atoms to the evolution of stars and the universe as a whol In spite of these successes, there are still many problems that remain to be solved. One of the deepest problems in modern physics is the problem of quantum gravity. The general theory of relativity is formulated within the framework of classical physics, whereas the other fundamental forces are described within the framework of quantum mechanics. A quantum theory of gravity is needed in or...