NASA’s New Horizons spacecraft is hurtling out of the photo voltaic system at an unimaginable velocity. It’s at present about 8 billion kilometres from the solar, and by the point you end studying this story, it is going to have sped hundreds of kilometres additional into the frigid gloom. It’s lonely on the market. Even the enormous planet Jupiter is however a tiny speck.

New Horizons is principally identified for giving us our first correct have a look at the dwarf planet Pluto in 2015. Till then, we had solely seen it as a blurry smudge. It has additionally taught us a lot concerning the photo voltaic system’s outer reaches and the small, frozen worlds that float there. “It’s actually been an Alice in Wonderland type of story,” says Alan Stern, the principal investigator of the mission. “It’s been dreamlike and we’ve found great issues.”

Nevertheless, the dream isn’t over but as a result of New Horizons could also be poised for a shock ultimate act. In early 2024, one in all its detectors recorded an sudden uptick within the quantity of mud it was encountering. Since that materials might have been created in collisions between rock fragments, astronomers now marvel if there are various objects past the rubble-strewn Kuiper belt typically thought-about the sting of the photo voltaic system. In that case, our system’s boundaries will have to be redrawn and our fashions of the way it shaped thrown into doubt.

Stern and his colleagues are clearly eager to reap the benefits of their probe’s distinctive place to study extra about this unexplored wilderness whereas they nonetheless can. “It’s an…