The early solar system was a strange place.
zipped even closer to this small Kuiper Belt object that turned out to be two chunks of material that were connected Right now, we still only have preliminary images of MU69 because the rates of data transmission from ~6.4 billion kilometers away are very, very low, but over the next few months, we should see better resolution shots of this object.A view of MU69 during New Horizon’s flyby on January 1, 2019. NASA.
However, these early views show something entirely foreign. Unlike Bennu, MU69‘s surface is oddly smooth except for a few small craters and could betray that the objects is a melange of rock and ice — in a sense, a comet-in-waiting. Its location in the outer solar system also likely limited its early encounters with other objects, which means it probably saw fewer impacts. MU69 is a lot larger than Bennu, spanning 31 kilometers across, but as objects in the solar system go, it is pretty small.
That’s why exploring the solar system is so amazing! Not only do we get to visit objects potentially billions of kilometers away, but we are, in a very real sense, looking back in time to see how the solar system formed. The Earth has changed so much since it formed thanks to plate tectonics. Bennu and MU69 may retain much of the properties of the stuff that was around when all the planets were still trying to gobble up as much material as they could to become what they are today.
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