HE FOUND THAT GALAXIES WERE MOVING AWAY FROM US , THAT THE UNIVERSE WAS EXPANDING.
Henrietta Swan Leavitt....American astronomer. Though she received little recognition in her lifetime, it was her discovery that first allowed astronomers to measure the distance between the Earth and faraway galaxies. After Leavitt's death, Edwin Hubble used the luminosity-period relation for Cepheids to determine that the universe is expanding (see Hubble's law).
The Hubble Tuning Fork After he discovered what galaxies really were, Edwin Hubble became the first person to classify galaxies. Astronomers use his system, called the "Hubble Tuning Fork," even today. First, Hubble divided the galaxies into two general categories: elliptical and spiral galaxies. Elliptical galaxies are shaped like ellipses, and spiral galaxies are shaped like spirals, with arms winding in to a bright center. Elliptical galaxies are classified by how round or flat they look. …
"Edwin Hubble: The Discoverer of the Big Bang Universe" delves into the work of astronomer Edwin Hubble, widely credited for our knowledge of an expanding universe. In two parts, the book first discusses his contributions and then puts these in context by juxtaposing them with discoveries made by others since. CCSS.ELA-Literacy.RST.11-12.5. & 8. - Anna Lacson
On the night of December 13, 1908, the 60-inch diameter reflecting telescope of Mount Wilson Observatory was first tested on the stars. Now-famous astronomers, including Harlow Shapley and Edwin Hubble, were able to use the 60-inch reflector to embark on a new kind of exploration of stars, distant galaxies, and the nature of the universe.
The Hubble Space Telescope (HST) is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation. A 2.4-metre (7.9 ft) aperture telescope in low Earth orbit, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared. The telescope is named after the astronomer Edwin Hubble.