Shedding the years

2019-03-07 12:11:14

ASTRONOMERS may have to knock over a billion years off the age of the Universe. New observations of Cepheid variable stars in NGC4258, the only galaxy whose distance is accurately known (see New Scientist, 7 August, p 25), nudge the Hubble constant about 15 per cent higher—suggesting that the Universe is expanding more quickly (Nature, vol 401, p 351). “It may require a change in the age of the Universe,” says Eyal Maoz of NASA Ames in Moffett Field, California,