- #1
benzun_1999
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hi all,
I am confuced. what is space time excatly?
-benzun
I am confuced. what is space time excatly?
-benzun
I would like to refine this statement a bit. I would say that curvature of spacetime causes the tidal force. Stress energy causes the curvature. Solids, liquids and gases have stress energy, so they cause curvature. But, to understand how these things look in space-time (I'm assuming you want the 4-D intution), first, consider a 2-D version. Then, extrude that in a third dimension. And motion of the solid, liquid or gas will show up as variations in the extrusion. You can't really do the 2-D version for gravity. It would be kind of like a fan out in the raidal direction and a convergence in the azimuthal direction.Originally posted by benzun_1999
a curve in spacetime causes gravity.
Space-time refers to the four-dimensional continuum in which all events in the universe are located. It combines the three dimensions of space (length, width, and height) with the dimension of time, creating a unified concept of space and time.
According to Einstein's theory of general relativity, gravity is not a force between objects, but rather a curvature of space-time caused by the presence of massive objects. This means that the mass of an object determines how much it bends space-time around it, and this bending affects the motion of other objects in its vicinity.
The concept of space-time is a mathematical model used to describe the structure of the universe. It is not a tangible physical entity that can be observed or measured. However, the effects of space-time, such as the bending of light and the movement of objects, can be observed and measured.
The Big Bang theory suggests that the universe began as a singularity (a point of infinite density) and has been expanding ever since. This expansion occurs within the fabric of space-time, meaning that as the universe expands, so does space-time. The Big Bang theory is based on Einstein's theory of general relativity, which explains the relationship between space-time and gravity.
Yes, according to general relativity, space-time can be warped or distorted by the presence of massive objects. This means that the shape of space-time can be altered by the mass and energy of objects within it. This concept is essential in understanding the behavior of objects in the universe, including the movement of planets, stars, and galaxies.