deletions | additions       diff --git a/Find_the_average_vel.tex b/Find_the_average_vel.tex  index b057fcb..8866f13 100644  --- a/Find_the_average_vel.tex  +++ b/Find_the_average_vel.tex 
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other cosmological parameters made by students in the Astro group here at the University of Melbourne:  \url{http://ph.unimelb.edu.au/cosmocalc/input.php} .   Compare the age of the universe Universe  with various other ages. The age of the Earth is thought to be about $4.6 \times 10^9$ years. The age of the Sun   and the rest of the solar system is probably similar. The age of our  galaxy is estimated as about $10^{10}$ years.