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The origin of disk galaxies is a central problem in galaxy formation. In the prevailing paradigm, disks inherit angular momentum from their host halos. However, deep HST surveys have revealed that disk galaxies are a recent phenomenon: disks start to appear in massive galaxies only around z~2 and disk settling in lower-mass galaxies is delayed until even later. Since halo spins do not depend on mass or redshift in LCDM, these observations indicate that the standard model is at best incomplete.doi:10.5281/zenodo.4428805 fatcat:euocopllsvfmnde6xxuit3h6je