You are correct, in principle although not in fact, and there is no upper limit. The objects at the edge of our observable universe are receding from us at about 3c. "Moves" however, is not really the right word to use here, having as it does, the connotation of proper motion, of which there is non in this situation. "Receding" is the right word to use.zuz said:I have read that Hubbles law states that a galaxys speed as it moves away from us is proportional to it's distance. Does this have an upper limit? If a galaxy 1 megaparsec is moving at 70 km/s, a galaxy 10,000,000 mgp away is moving faster then light. Or am I (most likely) mistaken?
Hubble's Law is a fundamental principle in astrophysics that describes the relationship between the distance and speed of galaxies. It states that the farther a galaxy is from Earth, the faster it is moving away from us.
Hubble's Law was first discovered by American astronomer Edwin Hubble in the 1920s. He observed that the light from distant galaxies was shifted towards the red end of the spectrum, indicating that they were moving away from us. By measuring the amount of redshift, Hubble was able to calculate the speed and distance of these galaxies.
Hubble's Law is significant because it provides evidence for the expansion of the universe. It also supports the Big Bang theory, which states that the universe began as a single point and has been expanding ever since. Additionally, Hubble's Law allows us to estimate the age of the universe and understand its overall structure.
The upper limit of Hubble's Law is the speed of light, which is approximately 300,000 kilometers per second. This means that no galaxy can move away from us faster than the speed of light. However, due to the expansion of the universe, the distance between galaxies can increase faster than the speed of light.
Hubble's Law is a crucial tool in cosmology, the study of the origin and evolution of the universe. It is used to measure the rate of expansion of the universe and to determine the distance to faraway galaxies. This information is then used to create models of the universe and understand its past, present, and future.