Megan Donahue

I will show results of X-ray and HST observations of high redshift (z$\approx$0.8) clusters of galaxies. The first cluster, MS1054-0321 is hot enough and thus massive enough to be very strong evidence that $\Omega$₀ is not equal to one, nearly independent of the normalization and slope of initial density fluctuations. The second cluster, MS1137+66, seems to contain iron. This is the most distant bonafide cluster with a measured iron abundance. Morphological classification of galaxies in both clusters are underway.