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Hubble proved that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. [4] He used the strong direct relationship between a classical Cepheid variable 's luminosity and pulsation period [ 5 ] [ 6 ] (discovered in 1908 by Henrietta Swan Leavitt [ 7 ] ) for scaling ...
The Hubble sequence is a morphological classification scheme for galaxies published by Edwin Hubble in 1926. [1] [2 ... Our own Milky Way is generally classed as Sc ...
The Milky Way [c] is the galaxy that includes the Solar System, ... [39] observations by Edwin Hubble in 1923 showed that the Milky Way is just one of many galaxies. ...
Us Earthlings inhabit a solar system on one of the great spiral arms of the Milky Way galaxy.The legendary Hubble Space Telescope, orbiting Earth, peered inward and captured a vivid image of stars ...
1995 — Hubble Deep Field survey of galaxies in field 144 arc seconds across. 1998 — The 2dF Galaxy Redshift Survey maps the large-scale structure in a section of the Universe close to the Milky Way. 1998 — The Hubble Deep Field South is compiled. 1998 — Discovery of accelerating universe. [13]
Some parts of space are a little more crowded than others. The Arches Cluster, located 25,000 light-years from Earth, is currently the densest known star cluster in the Milky Way. For comparison ...
In March 2019, observations from Hubble and data from the European Space Agency's Gaia space observatory were combined to determine that the mass of the Milky Way Galaxy is approximately 1.5 trillion times the mass of the Sun, a value intermediate between prior estimates. [195]
The term "The Local Group" was introduced by Edwin Hubble in Chapter VI of his 1936 book The Realm of the Nebulae. [11] There, he described it as "a typical small group of nebulae which is isolated in the general field" and delineated, by decreasing luminosity, its members to be M31, Milky Way, M33, Large Magellanic Cloud, Small Magellanic Cloud, M32, NGC 205, NGC 6822, NGC 185, IC 1613 and ...