her new url is http://faculty.cns.uni.edu/~morgan/ajjar/Cosmology/cosmos.html her cosmology calculator is a handy resource especially since Ned Wright modified his cosmology calculator earlier this year----July sometime. Now, with Wright's, you can't input a redshift z. You have to input a "light travel time" and then it tells you the z. this is not intuitive to me because what one OBSERVES is a redshift z and then one wants to know things like how far away and what light travel time was etc. ============ with Siobhan you have to type in parameters 0.27 for "omega" (abbr. omega sub matter, the matter component) 0.73 for "lambda" (cosmological constant component) 71 for H Ned Wright gives you these values of the parameters as a default. If anyone has a link for some other alternative cosmology calculator, please post. I think Hellfire programmed his own but i don't have a link.