According to Jack, our universe will collapse in on itself some time between the next 60 to 70 trillion years. The universe contains too much matter to keep expanding. According to Jack, a massive spherical grid of subspace field generators could be used to manipulate subspace to reduce the mass of the universe and change the cosmological constant. This would avert the collapse. (DS9: "Chrysalis") According to the 2009 comic book The Ends of Eternity, in the Star Trek: Crew miniseries, the universe ends one hundred billion years into the future.