gnostek1 / 10
- 01ʻOumuamua's length-to-width ratio was estimated at 10:1 — no known natural asteroid or comet matches that shape.
- 02It accelerated as it left the solar system at a rate that puzzled researchers; no outgassing was observed.
- 03Harvard's Avi Loeb published a peer-reviewed paper in 2018 arguing a light sail was the best explanation.