No, it's just lost.kent davidge said:If so, is that energy contributing to the expansion of the universe?
What about the conservation of energy?Bandersnatch said:No, it's just lost.
Energy is not (always) conserved in General Relativity. The pages below have good layman-oriented explanations of the why.kent davidge said:What about the conservation of energy?
Bandersnatch said:Energy is not (always) conserved in General Relativity. The pages below have good layman-oriented explanations of the why.
http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/
http://math.ucr.edu/home/baez/physics/Relativity/GR/energy_gr.html
Nowhere. It is just lost.kent davidge said:Where goes this lost energy?
I understood it now. Thank you.Bandersnatch said:Nowhere. It is just lost.
Conservation laws depend on symmetries. If there's no time-translation symmetry (as with the expanding universe), there can't be energy conservation, so it doesn't make sense to ask where it went - why would it need go somewhere if there is no conservation law?
Redshift is a phenomenon in which light from an object appears to be shifted towards longer (redder) wavelengths. This is caused by the expansion of the universe, as the space between galaxies is stretching, causing the light to appear stretched out. The amount of redshift can provide information about how fast the object is moving away from us and the rate of expansion of the universe.
Scientists measure the redshift of galaxies by using a tool called a spectrometer, which separates light into its different wavelengths. By analyzing the spectrum of light from a galaxy, scientists can determine the amount of redshift and use it to calculate the galaxy's distance and velocity.
The redshift value is crucial in understanding the age and size of the universe because it provides evidence for the expansion of the universe. The higher the redshift value, the further away the object is and the longer its light has been traveling towards us. This allows scientists to estimate the age of the universe and its rate of expansion.
Yes, redshifts of galaxies can change over time. This is because the expansion of the universe is not constant and can fluctuate due to the influence of dark matter and dark energy. However, the change in redshifts is usually very small and not noticeable on a human timescale.
The expanding universe is a key piece of evidence that supports the Big Bang theory. As the universe expands, it also cools down, which matches the predictions of the Big Bang theory. Additionally, the redshift of galaxies provides evidence for the universe's expansion from a single, dense point in the past, which is a fundamental aspect of the Big Bang theory.