Nature 403, 381– 382 (2000)
In this communication, I estimated the biomass that could be supported by mixing the ice irradiation products HCHO and H2O2 into Europa's ocean, finding values that ranged from ∼107 g to ∼1010 g. However, a calculational error in the higher estimate has recently come to my attention (E. J. Gaidos, K. N. Nealson and J. L. Kirschvink, personal communication). The correct result is ∼108 g, making detectability of potential Europan life under this model considerably more difficult. I present a revised calculation and discuss related practical issues in the search for life on Europa at http://www.seti.org/pdf/chyba_lander.pdf.
The online version of the original article can be found at 10.1038/35000281