Did this some months ago (same with Smileyface Killer). It's pretty much just some force that is eating away or sucking the life out of the planets.
For Luminarium's 19th exhibit, Dark Side of the Mind.
Base planet is by the very talented artist, freelancah (http://freelancah.deviantart.com), which has been edited over with extra textures and paint. Hope I do it some justice.