The 'Hubble Tension' denotes the difference between the observed and expected expansion rate of the universe. The James Webb Space Telescope refines measurements previously made by the Hubble Space Telescope. Despite advancements, questions persist about the universe's swift expansion and potential
Combined observations from NASA’s NIRCam and Hubble’s WFC3 show spiral galaxy NGC 5584, which resides 72 million light-years away from Earth. Among NGC 5584’s glowing stars are pulsating stars called Cepheid variables and Type Ia supernova, a special class of exploding stars. Astronomers use Cepheid variables and Type Ia supernovae as reliable distance markers to measure the universe’s expansion rate. Credit: NASA, ESA, CSA, and A.
The rate at which the universe is expanding, known as the Hubble constant, is one of the fundamental parameters for understanding the evolution and ultimate fate of the cosmos.
of the galaxies tell us how much the universe expanded over that time, hence telling us the expansionThis diagram illustrates the combined power of the NASA’s Hubble and Webb space telescopes in nailing down precise distances to a special class of variable star that is used in calibrating the expansion rate of the universe. These Cepheid variable stars are seen in crowded star fields. Light contamination from surrounding stars may make the measurement of the brightness of a Cepheid less precise.
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