News Planetary Science Pluto’s heart-shaped basin might not hide an ocean after all A buried rocky remnant from an impact could explain Sputnik Planitia’s odd location Pluto’s heart-shaped Sputnik Planitia is probably an impact basin that formed billions of years ago. Scientists have proposed that the impactor left behind a dense rocky remnant that has kept the basin from moving toward the poles. NASA, JHUAPL, SwRI Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Adam Mann April 22, 2024 at 11:00 am Rather than a vast ocean, Pluto’s heart might be hiding a huge, heavy treasure.