You will know that the Hubble law is evidence that the Universe is expanding. You will know that the Universe is expanding but not individual galaxies. You will know that there is no center or edge of...You will know that the Hubble law is evidence that the Universe is expanding. You will know that the Universe is expanding but not individual galaxies. You will know that there is no center or edge of the Universe.
You will know that the Hubble law is evidence that the Universe is expanding. You will know that the Universe is expanding but not individual galaxies. You will know that there is no center or edge of...You will know that the Hubble law is evidence that the Universe is expanding. You will know that the Universe is expanding but not individual galaxies. You will know that there is no center or edge of the Universe.
Previously, we saw that the proper distance between two objects can increase or decrease with time depending on the function a(t) , even if the objects are "stationary". What if those two "objects" a...Previously, we saw that the proper distance between two objects can increase or decrease with time depending on the function a(t) , even if the objects are "stationary". What if those two "objects" are the crests of a light wave? As the light wave travels, then distance between those two crests can change. This causes the wavelength, and therefore the frequency, of the wave to change. We refer to this as cosmological redshift.
