Two bodies converged to create ‘rubber ducky’ comet’s odd shape, say scientists

The comet being studied by Europe’s orbiting Rosetta spacecraft began as two separate bodies that later came together, creating the comet’s odd “rubber ducky” shape, according to a study published on Monday.

The source of the comet’s twin lobes has been a subject of debate for more than a year. Rosetta settled into orbit around the comet, known as 67P/Churyumov-Gerasimenko or 67P, in August 2014 for a long-term study.

In November, Rosetta dispatched a piggyback-riding spacecraft named Philae, which descended to the comet’s surface for independent studies. Scientists are still trying to re-establish contact with Philae in hopes of a follow-on mission.

Meanwhile, one of the comet’s biggest mysteries has been resolved. Writing in this week’s issue of the journal Nature, scientists put to rest theories that the comet’s so-called neck region had eroded away, leaving two connected lobes.

Instead, analysis of high-resolution images taken by Rosetta between August 2014 and March 2015 show that the lobes originally were two independent, though similar bodies.