I'm currently looking into the values for the 'critical density' and 'cosmological constant', I managed to calculate a figure for the critical density which was close to the generally accepted figure, with lambda I came up with an astronomically small number which I later realised after searching the web was close to the accepted value (my figure being 1.67 E-55 cm^-2). The most common way I've seen Lambda expressed is 10^-29 g/cm^3 which are the units used when calculating omega lambda. I'd be interested to know how the first figure in cm^-2 converts into g/cm^3. Any feedback would be welcome. cheers Steve On a side note, any info regarding changing the value into planck units would be appreciated also.