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Pete81t
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Or is it the other way around? Either way, how do we know this? (I read somewhere that Einstein taught that they existed within the universe, but how he came up with this idea, that's the question.)
I can only say that, in physics, with "universe" we mean not only matter, energy and bodies of various kind, but space and time as well.Pete81t said:Or is it the other way around? Either way, how do we know this? (I read somewhere that Einstein taught that they existed within the universe, but how he came up with this idea, that's the question.)
Use a rod or ruler.Bojan Keevill said:How can I design an experiment which tests for 1 m of space?
Use a clockBojan Keevill said:How can I design an experiment which tests for 1 s of time?
Compare your rod and clock to existing standards.Bojan Keevill said:How would I implement controls for these experiments?
DaleSpam said:Use a rod or ruler.Use a clockCompare your rod and clock to existing standards.
lightarrow said:I can only say that, in physics, with "universe" we mean not only matter, energy and bodies of various kind, but space and time as well.
However, according to Einstein's General Relativity theory, it comes out that the very matter and energy, in a certain way, create space and time, because some properties of space and time are determined by the mass and the energy which are present there.
Is this related to what you wanted to ask?
In reality, it's (Number of goals scored by Germany at the World Cup so far)3.1I found that total proton mass-energy was approximate to the sum of quarks2.7
Whatever happened to thinking about physics anyway?
Ich said:In reality, it's (Number of goals scored by Germany at the World Cup so far)3.1
It means that a proton is round.
What I wanted to convey:
If you do the math, be sure you know what you're doing. That's the kind of thinking required in physics, 100 years ago and now.
Chronos said:Time without space is like knowledge without ignorance.
nismaratwork said:I think it would be fair to say that the Universe is spacetime, within which such oddities as mass act to warp it. In a more general sense, isn't a universe simply a region in which physical constants (aka the laws of physics) are uniform? In that sense, there is no "within" a universe, because that implies a 3D body you can leave.
Whatever happened to actually learning about a subject before thinking that you knew enough to make reasonable critiques? The pace of scientific debate and thought has increased dramatically since the 1900's, particularly with the advent of improved communications. To make this comment shows an enormous ignorance about the field and history.Bojan Keevill said:Whatever happened to thinking about physics anyway? During the early 1900's physicists did a lot of thinking and debating as well as experimentation in combination with mathematics. Recently it seems, thinking has been outmoded in the field of physical study
Bojan Keevill said:I was under the (possibly erroneous) impression that spacetime is a model Universe. Also that aspects of the model change relative to dynamic points of observation. The impression I have is that the manner in which one experiences time is changeable and dependent on the rate at which one interacts with space, relative to some other point of space interaction.
I would agree that spacetime is a useful idea, but am having great difficulty in placing it as the (or a) physical universal foundation. Spacetime seems somewhat analogous to the grid of longitudinal and latitudinal lines we paint on a globe in order to navigate more easily.
...but able to criticize physics? You shouldn't be surprised to find yourself criticized as well, if you betray such a lack of understanding together with this attitude.I suppose you are poking fun. Fair enough. I am not a physicist or mathematician, so am able to do only the simplest calculations.
Hmm, now I get ()2.7, too.In reality, it's (Number of goals scored by Germany at the World Cup so far)3.1
The concept of time and space in the universe refers to the dimensions in which all objects and events occur. Time is often described as the fourth dimension, while space is considered to have three dimensions - length, width, and height. Together, time and space create the fabric of the universe that allows for movement and change.
Time and space are interconnected and cannot exist without each other. The theory of relativity proposed by Albert Einstein states that time and space are relative and can be affected by the presence of matter and energy. This means that time and space are not absolute and can be distorted by gravity and other forces.
The expansion of the universe affects the concept of time and space by causing the fabric of space-time to stretch. This means that objects and events in the universe are moving further apart from each other, leading to an increase in the distance between them. As a result, time and space are also expanding, and the rate of this expansion is constantly changing.
According to current scientific theories, there is no known limit to the size of the universe in terms of time and space. The universe is believed to be infinite, with no edge or boundary. However, the observable universe is limited by the speed of light, which means we can only see a certain portion of the universe due to the time it takes for light to reach us.
Scientists use various methods to measure time and space in the universe. One commonly used method is through the use of astronomical units, which are based on the distance between the Earth and the Sun. Other methods include using the speed of light and the redshift of galaxies. Additionally, advanced technologies such as telescopes and satellites are used to gather data and make more accurate measurements of time and space in the universe.