AS102 Study Guide - Final Guide: Hubble Space Telescope, Cosmic Distance Ladder
Document Summary
After making various measurements on distant galaxies hubble stated; "the more distant a galaxy the faster it moves away from us", which became known as hubble"s law. This brief video (about 4 minutes long) explains hubble"s contribution to our current understanding of the universe. In places the quality of the video is not great but the information is presented in a clear, concise manner. http://www. youtube. com/watch?v=hvaptle7csc. Hubble"s original data from which he made this important discovery is shown below. He plotted velocity (vertically) against distance (in parsecs similar to ly) (horizontally). We now know that he underestimated the distances because his standard candle was not quite right, but that eventually got sorted out. We can write hubble"s law in a mathematical form: v = ho d where v is velocity of the galaxy away from us, d is its distance from us, and ho is the hubble constant. Clearly the formula works if we know the value of ho accurately.
