Hubble constant changed: Best measure of expansion rate of universe made

With a new analysis of the data obtained from the Hubble Space Telescope, which has been operating for about 30 years, scientists have determined how fast the universe is expanding at different distances from a certain point in space. They have achieved the most precise measurement ever of the Hubble constant that defines it.

James Webb will take the work further

In the 1920s, research on the expansion of the universe began with measurements made by astronomers Edwin Powell Hubble and Georges Lemaître. Hubble said that over time, other galaxies outside of our galaxy are moving away from us, and this rate of departure increases over time.

In a new study by NASA scientists on the expansion rate of the universe, 42 galaxies, including both Cepheids and Type Ia supernovae, observed thanks to the Hubble Space Telescope, which became operational in 1990, were examined and the expansion rate of the universe was megaparsec (plus or minus 1). They found it to be 73 kilometers per second per second.

NASA will expand approaches to study the expansion of the universe. It is stated that the James Webb Space Telescope, which can examine longer distances and higher resolution than Hubble, can offer important benefits to expand the studies.