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Giant stellar clumps are ubiquitous in high-redshift galaxies. They arethought to play an important role in the build-up of galactic bulges and asdiagnostics of star formation feedback in galactic discs. Hubble SpaceTelescope (HST) blank field imaging surveys have estimated that these clumpshave masses up to 10$^{9.5}$ M$_{\odot}$ and linear sizes larger than ~1 kpc.Recently, gravitational lensing has also been used to get higher spatialresolution. However, both recent lensed observations and models suggest thatthe clumps properties may be overestimated by the limited resolution ofstandard imaging techniques. A definitive proof of this observational bias isnevertheless still missing. Here we investigate directly the effect ofresolution on clump properties by analysing multiple gravitationally-lensedimages of the same galaxy at different spatial resolutions, down to 30 pc. Weshow that the typical mass and size of giant clumps, generally observed at$\sim$1 kpc resolution in high-redshift galaxies, are systematicallyoverestimated. The high spatial resolution data, only enabled by stronggravitational lensing using currently available facilities, support smallerscales of clump formation by fragmentation of the galactic gas disk viagravitational instabilities.

The nature of giant clumps in distant galaxies probed by the anatomy of the Cosmic Snake