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‘Space archaeologists’ use oxygen map to reconstruct a galaxy’s 12-billion-year past
The oxygen in a galaxy does not sit still. It spreads, thins out, piles up, and leaves behind a record of where stars formed, where gas moved, and when smaller galaxies crashed in. In the nearby ...
Map of the line emission of hydrogen (in red and blue) and oxygen (in green) in the PJ308-21 system, shown after masking the light from the central quasar ("QSO"). The different colours of the ...
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