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Man Built a Tennis Ball-Sized 'Artificial Sun' and Switched It on in a Dark Forest

'I've never seen a light like this before. That is wild,' YouTuber Mathew Perks said.

HETDEX data reveal a vast 'sea of light' between early galaxies

Astronomers with the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) have used data from the project to make the ...