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The pronunciation of the name Uranus preferred among astronomers is / ˈ jʊər ə n ə s / YOOR-ə-nəs, [1] with the long "u" of English and stress on the first syllable as in Latin Uranus, in contrast to / j ʊ ˈ r eɪ n ə s / yoo-RAY-nəs, with stress on the second syllable and a long a, though both are considered acceptable. [g]
The Earth's crust from the surface to 25 km (15 mi) down is calculated to contain 10 17 kg (2 × 10 17 lb) of uranium while the oceans may contain 10 13 kg (2 × 10 13 lb). [11] The concentration of uranium in soil ranges from 0.7 to 11 parts per million (up to 15 parts per million in farmland soil due to use of phosphate fertilizers ), [ 63 ...
7–8 × 10 36 kg The supermassive black hole at the center of the Milky Way, associated with the radio source Sagittarius A* (3.7±0.2 × 10 6 M ☉) [165] 8 × 10 36 kg Omega centauri, the largest globular cluster in the Milky Way, containing approximately 10 million stars. 10 37 10 38 10 39 10 40 10 41: 1.98 × 10 41 kg
Uranus at European Space Agency; NASA's Uranus fact sheet; Uranus Profile at NASA's Solar System Exploration site; Planets – Uranus A kid's guide to Uranus. Uranus at Jet Propulsion Laboratory's planetary photojournal. (photos) Voyager at Uranus (photos) Uranus (Astronomy Cast homepage) (blog) Uranian system montage (photo) Gray, Meghan ...
The choice of solar mass, M ☉, as the basic unit for planetary mass comes directly from the calculations used to determine planetary mass.In the most precise case, that of the Earth itself, the mass is known in terms of solar masses to twelve significant figures: the same mass, in terms of kilograms or other Earth-based units, is only known to five significant figures, which is less than a ...
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Umbriel, along with another Uranian satellite, Ariel, was discovered by William Lassell on October 24, 1851. [10] [11] [12] Although William Herschel, the discoverer of Titania and Oberon, claimed at the end of the 18th century that he had observed four additional moons of Uranus, [13] his observations were not confirmed and those four objects are now thought to be spurious.