A new technique lets astronomers measure nearly invisible clouds of hydrogen gas from across the universe.
The post Seeing Shadows of Ancient Galaxies appeared first on Sky & Telescope.
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A new technique lets astronomers measure nearly invisible clouds of hydrogen gas from across the universe.
The post Seeing Shadows of Ancient Galaxies appeared first on Sky & Telescope.
from Sky & Telescope http://ift.tt/20aGjDT
via IFTTT
Telescopically 