How faint would a dwarf have to be for the universe to be 20 billion years old? Really really faint, I guess. :)
How faint would a dwarf have to be for the universe to be 20 billion years old? Really really faint, I guess. :) They apparently are running at the edge of the sensitivity of the old Hubble scope equipment; this is why they selected M4 -- they just didn't have enough sensitivity to see dwarfs that old any farther away that M4 is.