New Delhi, May 22 -- Neptune's far-flung moon Nereid may be the last of the planet's original companions that managed to survive a cosmic crash, scientists reported Wednesday.

Sixteen known moons circle Neptune, our solar system's eighth and most distant planet. Neptune's biggest moon, Triton, barged in from the solar system's frigid outskirts billions of years ago, scattering the planet's original moons and putting them on destructive collision courses.

A team led by the California Institute of Technology used NASA's Webb Space Telescope to study Nereid. Their observations suggest that Nereid is no party crasher like Triton and likely survived by escaping into its extreme, elliptical orbit around Neptune.

"What we know about Nereid is...