New study says first-known interstellar object was a planet chunk

What's happening: In a pair of papers published Wednesday, researchers from Arizona State University posit an explanation for Oumuamua, a flat, comet-like object that was discovered hurtling through our solar system in 2017.

• They argue the object is a chunk of an "exo-Pluto" — a Pluto-like planet from another solar system.
• Oumuamua was likely knocked off the surface of the exoplanet by an impact half a billion years ago and thrown out of its parent system, before wandering through ours.

Background: Oumuamua puzzled scientists when it was first discovered because it seemed like a comet but lacked some of the usual traits, like the detectable escaping gas that makes up a comet's tail.

• Harvard astrophysicist Avi Loeb even posited in a book published earlier this year that "the simplest explanation for [Oumuamua's] peculiarities is that the object was created by an intelligent civilization not of this Earth."

Reality check: The extreme skepticism with which Loeb's theories were met by the mainstream scientific community now seems warranted.

Our thought bubble: "Oumuamua likely won’t be the last interstellar visitor scientists find, so this kind of research is essential for placing the strange object in context with our solar system and others," my Axios Space colleague Miriam Kramer notes.

The bottom line: As Miriam — Axios' own Agent Scully — has repeatedly written: "It's never aliens."