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The cold classical Kuiper belt objects have low inclinations andeccentricities and are the only Kuiper belt population suspected to have formedin situ. Compared with the dynamically excited populations, which exhibit abroad range of colours and a low binary fraction of ~10% cold classical Kuiperbelt objects typically have red optical colours with ~30% of the populationfound in binary pairs; the origin of these differences remains unclear. Wereport the detection of a population of blue-coloured, tenuously bound binariesresiding among the cold classical Kuiper belt objects. Here we show that widelyseparated binaries could have survived push-out into the cold classical regionduring the early phases of Neptune's migration. The blue binaries may becontaminants, originating at ~38 au, and could provide a unique probe of theformative conditions in a region now nearly devoid of objects. The idea thatthe blue objects, which are predominantly binary, are the products of push-outrequires that the planetesimals formed entirely as multiples. Plausibleformation routes include planetesimal formation via pebble accretion andsubsequent binary production through dynamic friction and binary formationduring the collapse of a cloud of solids.

All planetesimals born near the Kuiper Belt formed as binaries