Daily Question # 231
Posted in Uncategorized on Jun 1st, 2009
A , B , C and D ( not shown ) constitute an exclusive list .
Just name D and which list is this ?
The 4 Great observatories of NASA are named after Edwin Hubble ( A ) , Arthur Holly Compton ( B ) , Lyman Spitzer ( C ) and S Chandrasekhar ( D [...]