Large exomoons unlikely around Kepler-1625 b and Kepler-1708 b, astronomers say

Only two of the more than 5,300 known exoplanets have so far provided evidence of moons in orbit around them. In observations of the planets Kepler-1625b and Kepler-1708b from the Kepler and Hubble space telescopes, researchers discovered traces of such moons for the first time.