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TimeRip496
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Does light moves (revolves) around around the mass like how moon orbits around the earth? Or revolution such as that of moon is only possible with something that has mass?
When a meteorite fly pass a planet/star, is it possible for it to revolve around that planet/star in an orbit? If yes, does it applies for light? These questions I believe will better help me understand what curvature is. Photon sphere(me not very sure about it)seems to only applies for massive object like black hole, something which is not very general.A.T. said:
TimeRip496 said:Photon sphere(me not very sure about it)seems to only applies for massive object like black hole, something which is not very general.
But isn't gravitational field just bend in spacetime? And that a moving object will move along that spacetime regardless of its speed? Likewise light will move along that bend space time regardlessly. My apologies for such stupid question as I am still starting.Nugatory said:It's a specific application of a very general theory. The faster something is moving, the stronger the gravitational field needed to keep it in orbit. Light moves very quickly indeed, so it needs a very strong gravitational field to hold it in orbit. That means a massive object like a black hole.
A very simple experiment will show you that the speed of the object makes a difference. Suppose you are standing at point A and you gently toss a ball at a target at point B; the ball follows a curved path to the target. Then you fire a bullet at the target; the bullet travels in a nearly straight line. So it seems clear that there is something different between the paths followed by the fast-moving bullet and the slow-moving ball.TimeRip496 said:But isn't gravitational field just bend in spacetime? And that a moving object will move along that spacetime regardless of its speed?
Different speeds in space ->different directions in space-time -> different worldlines in space-time -> different trajectories in spaceTimeRip496 said:And that a moving object will move along that spacetime regardless of its speed?
When you say the ball and bullet arrives at tge target at different points in spacetime, do you mean that they will arrive at the same location except at different point of time or both will end up at different location (e.g one end at on Mars while the other end up at uranus) as they will never end up in the same location regardless of time?Nugatory said:A very simple experiment will show you that the speed of the object makes a difference. Suppose you are standing at point A and you gently toss a ball at a target at point B; the ball follows a curved path to the target. Then you fire a bullet at the target; the bullet travels in a nearly straight line. So it seems clear that there is something different between the paths followed by the fast-moving bullet and the slow-moving ball.
What's going on here is that gravity is curvature in spacetime, not in just space. When you fire the bullet and throw the ball at the same time (that is, the bullet and the ball leave your hands at the same point in spacetime) the two arrive at the target at different times, and therefore different points in spacetime, even though the target is at the same point in space. Different paths means encountering different amount of curvature on the paths.
Light revolving around mass is a phenomenon in which light appears to curve or bend around massive objects, such as stars or planets, due to the distortion of space-time caused by the object's gravitational pull.
According to Einstein's theory of general relativity, massive objects create a curvature in space-time, which causes light to follow a curved path around them. This phenomenon is known as gravitational lensing.
Studying light revolving around mass can provide insights into the properties of massive objects and the nature of gravity. It can also be used to observe distant objects in the universe that would otherwise be invisible due to their small size or distance.
Light revolving around mass can be observed through various methods, such as using telescopes or satellites equipped with specialized instruments to detect and measure the bending of light. Astronomers also use computer models and simulations to study this phenomenon.
Understanding light revolving around mass has many practical applications, such as improving our understanding of the universe, aiding in the search for exoplanets, and helping to develop advanced technologies such as gravitational wave detectors. It also has potential applications in fields such as astrophysics, cosmology, and space exploration.