text: enybody know something about the solar sistem proplyd ? the planetary disc proplyd, do you think that other species populate any of thoose planets,so we are not alone in all universe. a protoplanetary disk (or proplyd) is a rotating disk of dense gas surrounding a young newly formed star.  you can read more about it here: http://en.wikipedia.org/wiki/protoplanetary_disk  with the vastness of space and the number of stars that form solar systems, the probability of intelligent life (perhaps not carbon based life as we know it) is almost a certainty.  the milky way galaxy is on the outer edge of the universe - which is why we haven't had visitors!