deletions | additions       diff --git a/The_Virgo_cluster_is_so__.tex b/The_Virgo_cluster_is_so__.tex  index 9d802fd..b062c14 100644  --- a/The_Virgo_cluster_is_so__.tex  +++ b/The_Virgo_cluster_is_so__.tex 
...
this decision in your notes). Otherwise, average the two numbers. It is  always worth measuring anything two ways to have a check.    \item The A recent measurement (http://arxiv.org/abs/astro-ph/0702510) puts the  distance to the  Virgo is controversial, but most current estimates are  around 15 cluster as $16.5 \pm 0.1$  Mpc. Use this, plus the ratios measured above, to find the distance to Hydra I.   \end{enumerate}  How does this answer compare with the earlier one? If they are different,  what is this telling us about the relative sizes of galaxies in Hydra I  and our galaxy?It could be that our distance to Virgo is wrong, as this   number is highly  controversial. Now that the Hubble Space Telescope has been fixed, an  international team (including several Australians) has been using it to   spot individual stars in Virgo galaxies, which will enable them to measure  the distance to Virgo accurately at last \ -- \ expect results in a year   or so.  \subsection{Hubble's Constant}