Galaxy War II has begun! You were assigned to a special assault squad as a decoder. Your mission is to solve all 4x4 squares that would block the team. Get ready, time is everything for the squad!
20111014
Dark matter ring in galaxy cluster
This is the source of the first background image in 4x4.
Dark matter ring in galaxy cluster Cl 0024+17 (ZwCl 0024+1652)
Credit:
NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)
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