The future of the Universe

If scientist could find out the density of the universe, they'll have an answer to if the Universe will expand forever, or if gravitational attraction between all objects will eventually slow to a stop, attracting everything back together in a 'Big Crunch' DARK ENERGY: - Since 1998, astronomical observations of supernova have suggested that distant galaxies are moving away increasingly faster (accelerating) - Dark energy is thought to cause the Universe to expand faster all the time - This would mean dark energy must account for 68% of the Universe DARK MATTER: - galaxies seem to rotate too quickly for the mass of their stars, this suggests that there is mass in the Universe that is invisible to the instruments used by scientists - Scientists only know it is there because it has gravity that affects objects nearby - Astronomers have calculated that 27% of the Universe must be made of this dark matter