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The early Universe at redshift z\sim6-11 marks the reionization of theintergalactic medium, following the formation of the first generation of stars.However, those young galaxies at a cosmic age of \lesssim 500 million years(Myr, at z \gtrsim 10) remain largely unexplored as they are at or beyond thesensitivity limits of current large telescopes. Gravitational lensing by galaxyclusters enables the detection of high-redshift galaxies that are fainter thanwhat otherwise could be found in the deepest images of the sky. We report thediscovery of an object found in the multi-band observations of the clusterMACS1149+22 that has a high probability of being a gravitationally magnifiedobject from the early universe. The object is firmly detected (12 sigma) in thetwo reddest bands of HST/WFC3, and not detected below 1.2 {\mu}m, matching thecharacteristics of z\sim9 objects. We derive a robust photometric redshift of z= 9.6 \pm 0.2, corresponding to a cosmic age of 490 \pm 15Myr (i.e., 3.6% ofthe age of the Universe). The large number of bands used to derive the redshiftestimate make it one of the most accurate estimates ever obtained for such adistant object. The significant magnification by cluster lensing (a factor of\sim15) allows us to analyze the object's ultra-violet and optical luminosityin its rest-frame, thus enabling us to constrain on its stellar mass,star-formation rate and age. If the galaxy is indeed at such a large redshift,then its age is less than 200 Myr (at the 95% confidence level), implying aformation redshift of zf \lesssim 14. The object is the first z>9 candidatethat is bright enough for detailed spectroscopic studies with JWST,demonstrating the unique potential of galaxy cluster fields for finding highlymagnified, intrinsically faint galaxies at the highest redshifts.

A highly magnified candidate for a young galaxy seen when the Universe was 500 Myrs old