«When you're so close to the star,
tidal interactions become so strong that they can rip apart the surface of a planet and destroy it,» says Roberto Sanchis - Ojeda, a graduate student at the Massachusetts Institute of Technology.
To begin with, they orbited close to the plane of the ecliptic in the same direction as the planets, but their orbits were deformed by the galaxy's
tidal force and by
interactions with nearby stars, gradually
becoming more inclined and forming a more or less spherical reservoir,» Morais said.