A universe aglow.
Credit: ESA/Hubble & NASA, ESO/ Lutz Wisotzki et al.
MUSE spectrograph reveals uncovered vast cosmic reservoirs of atomic hydrogen. An unexpected abundance of Lyman-alpha emission in the Hubble Ultra Deep Field (HUDF) region was discovered by an international team of astronomers using the MUSE instrument on ESO’s Very Large Telescope (VLT). The discovered emission covers nearly the entire field of view – leading the team to extrapolate that almost all of the sky is invisibly glowing with Lyman-alpha emission from the early Universe.
Astronomers have long been accustomed to the sky looking wildly different at different wavelengths, but the extent of the observed Lyman-alpha emission was still surprising...
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