Page 15, Cosmology: [Previous Page] [Next Page] [Class Home Page] Text Pages 430-432

Type I Supernova can be used to determine distances to galaxies billions of light years away. Click HERE for a movie. Recently, astronomers have used Type I SN in extremely distant galaxies to obtain distances. This is been compared to the distance obtained from Hubble's Law (redshift) below:

As we look back, the Type I SN are dimmer (farther away) than their Doppler shift would predict for a FLAT UNIVERSE. Why? The Universe is moving apart FASTER NOW than it was then.

That is to say: the UNIVERSE is SPEEDING UP. This was totally UNEXPECTED!!