PDA

View Full Version : The Little Cepheid that Stopped



Fraser
2011-Jan-14, 12:10 AM
When Hubble first discovered a Cepheid variable in the galaxy M31, the universe grew. Previously, many astronomers had held that the fuzzy “spiral nebulae” were small patches of gas and dust within our own galaxy, but through the Period-Luminosity relationship which allowed him to determine the distance, Hubble demonstrated that these were “island universes”, or [...]

More... (http://www.universetoday.com/82490/the-little-cepheid-that-stopped/)