Content tagged "dark energy".
3 items (3 articles, 0 stories)
NASA's Nancy Grace Roman Space Telescope is set to launch on August 30, 2026. With a field of view 100 times wider than Hubble, it will simultaneously attack three of astronomy's biggest puzzles: dark energy, exoplanets, and galaxy evolution. Here's what's happening on the ground before it leaves.
Stars, galaxies, gas — everything we can observe makes up just 5% of the universe. The other 95% is something we can't see. Dark matter and dark energy sit at the heart of modern cosmology, and we still don't know what either of them is.
Two different methods for measuring how fast the universe is expanding keep giving different answers. A landmark April 2026 measurement has now ruled out measurement error as the explanation — and what's left is genuinely unsettling.