Gravitational lensing acting as cosmic telescope and the exquisite angular resolution provided by JWST allow to peer into unprecedented small physical scales in the early Universe, once properly de-lensed. This opens to the possibility of accessing the still elusive formation of globular clusters in the early Universe. Such young stellar clusters are also the sites where O-type stars are mainly forged, making them key sources of (re-)ionizing radiation and stellar feedback, likely promoters for digging ionized tunnels through which the Lyman continuum radiation (λ<912A) can escape into the intergalactic medium. Such an enhanced spatial contrast is also key for the search of extremely metal poor and/or Population III stellar complexes in the first Gyr.
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