Henrietta Swan Leavitt, in 1893, joins the Harvard computers, a group of women engaged in the production of astronomical data at Harvard; she is instrumental in discovery of the cepheid variable stars, which were evidence for the expansion of the universe.
Hubble image of variable star RS Puppis: is a Cepheid variable star in the constellation of Puppis. It is one of the brightest known Cepheids in the Milky Way galaxy. It is located in a nebula, about 6500 ly distance.
The expansion of the universe is getting out of hand. According to recent measurements by a Nobel prizewinning team, space is stretching 9 per cent faster than we think it should be – yanking distant galaxies away from us at a rate that defies easy explanation. https://www.newscientist.com/article/2091933-why-is-the-universe-expanding-9-per-cent-faster-than-we-thought/