NASA’s New Horizons spacecraft is on its way to a tiny rock in the outer reaches of the solar system. We don’t know much about that rock, but now we think it might have a moon.
From the few observations we do have, we’ve narrowed down the shape of MU69 to three main options: a bulbous peanut shape, a ‘contact binary’ with two rocks that touch one another, or even two separate objects orbiting one another.
Most of what we know about MU69 comes from pictures taken during occultations – times when the little rock passes between a bright star and our
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