IC 10 is an irregular galaxy in the constellation Cassiopeia.
 It was discovered by Lewis Swift in 1887 and in 1935 Nicholas Mayall became the first to suggest that the object is extragalactic.
 Edwin Hubble suspected it might belong to the Local Group of galaxies, but its status remained uncertain for decades.
 The radial velocity of IC 10 was measured in 1962, and it was found to be approaching the Milky Way at approximately
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.
 Unlike flat spiral galaxies with organization and structure, they are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.
 They are one of the three main classes of galaxy originally described by Edwin Hubble in his 1936 work "The Realm of the Nebulae", along with spiral and lenticular galaxies.
 Elliptical galaxies range in shape from nearly spherical to highly flat and in size from tens of millions to over one hundred trillion stars. Originally Edwin Hubble hypothesized that elliptical galaxies evolved into spiral galaxies, which was later discovered to be false.
 Stars found inside of elliptical galaxies are on average much older than stars found in spiral galaxies.
Georges Henri Joseph Édouard Lemaître Associate RAS (] ; 17 July 1894 – 20 June 1966) was a Belgian Catholic Priest, astronomer and professor of physics at the Catholic University of Leuven.
 He proposed the theory of the expansion of the universe, widely misattributed to Edwin Hubble.
 He was the first to derive what is now known as Hubble's law and made the first estimation of what is now called the Hubble constant, which he published in 1927, two years before Hubble's article.
Edwin Hubble House is a National Historic Landmark house located at 1340 Woodstock Road, in San Marino, California.
 It was the home of astronomer Edwin Hubble.
 He lived there from 1925 until he died in 1953, and the house remained in the Hubble family until approximately 1973.
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
 Although not the first space telescope, Hubble is one of the largest and most versatile, and is well known as both a vital research tool and a public relations boon for astronomy.
 The HST is named after the astronomer Edwin Hubble, and is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.
An intermediate spiral galaxy is a galaxy that is in between the classifications of a barred spiral galaxy and an unbarred spiral galaxy.
 It is designated as SAB in the galaxy morphological classification scheme.
 By definition, a galaxy is a congregation of stars held together by gravity.
 The first intermediate spiral galaxy discovered is the Milky Way, by Galileo, in 1610.
 He was the first person with a telescope powerful enough to make such a discovery.
 Before Galileo, it was thought that all bright objects in the sky were either the planets in the Solar System, moons, comets, or stars.
 Until the beginning on the twentieth century, astronomers did not know the size of the Universe, but speculated it to be about as big as the Milky Way.
 In 1920, at the National Academy of Science, there was a big debate between Harlow Shapley and Heber D. Curtis on whether nebulae are small globular clusters surrounding the Milky Way, or separate galaxies located farther away.
 Nothing was resolved at the debate; neither side was able to provide conclusive evidence to prove their side correct over their opponent.
 In 1923, Edwin Hubble resolved the matter with a photograph that he took of the Andromeda Galaxy.
 What he found in his photograph was a very bright light source pulsing at a certain rate, a Cepheid variable, located outside the Milky Way.
 This can be used to determine the distance to it.
 Hubble proved that the Universe was full of galaxies, and disproved that the Milky Way was the extent of the Universe.
 There are many types of galaxies in the Universe, elliptical, barred spiral galaxies; they vary in shape and size, but on average spiral galaxies are the most abundant.
The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926.
 It is often known colloquially as the Hubble tuning fork diagram because of the shape in which it is traditionally represented.
2069 Hubble, provisional designation 1955 FT, is a carbonacous asteroid from the outer region of the asteroid belt, approximately 40 kilometers in diameter.
 It was discovered on 29 March 1955, by the Indiana Asteroid Program at Goethe Link Observatory, United States, and named after American astronomer Edwin Hubble.
Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer.
 He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology and is regarded as one of the most important astronomers of all time.
John Henry Reynolds (1874–1949) was a British astronomer who served as the president of the Royal Astronomical Society between 1935 and 1937 and is known for his work on the classification of stellar bodies.
 An amateur, he was the son of Alfred John Reynolds, the Lord Mayor of Birmingham, who owned a company which cut nails.
 In 1899, at age 25, he was elected a Fellow of the Royal Astronomical Society and in 1907, he financed the construction of a 30-inch reflecting telescope in Helwan, Egypt, the first large telescope to study objects in the such southerly skies.
 He also hand-constructed a 28-inch telescope in Harborne.
 Images from the Reynolds telescope was later used by Gérard de Vaucouleurs in his system of classifying galaxies; Reynolds also published his own classification for spiral galaxies in 1920.
 Edwin Hubble frequently corresponded with Reynolds, and some of his findings into the classification of stellar bodies seems at least inspired by his work.
 The Hubble–Reynolds law, a formula for measuring the surface brightness of elliptical galaxies, is named after them.

Question: What profession did both John Reynolds and Edwin Hubble belong to? 
Answer: astronomers