A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to the host star, and gas planets toward the exterior. That’s how planets are organized around our sun, with rocky Mercury, Venus, Earth and Mars first in the lineup, followed by the gaseous Jupiter, Saturn, Uranus and Neptune.