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The most widely accepted model of planetary formation is known as the nebular hypothesis.This model posits that, 4.6 billion years ago, the Solar System was formed by the gravitational collapse of a giant molecular cloud spanning several light-years.
The widely accepted modern variant of the nebular theory is the solar nebular ... At the age of about 1 million ... Gas in the central part of the nebula, ...
NGC 1714 is an emission nebula in the constellation of Dorado. [1] [2] It is located in the Large Magellanic Cloud [3] and was discovered by John Herschel on 2 November 1834. [4]A study investigating the chemical composition of HII regions in the Large Magellanic Cloud was conducted in it, finding a larger deuterium density than previously thought, leading to (with current knowledge) larger ...
To estimate the age of the Solar System, scientists use meteorites, which were formed during the early condensation of the solar nebula. Almost all meteorites (see the Canyon Diablo meteorite) are found to have an age of 4.6 billion years, suggesting that the Solar System must be at least this old. [141]
NGC 6164, known as the Dragon's Egg Nebula, [1] [2] is an emission nebula located in the constellation Norma.The nebula was discovered by astronomer John Herschel in 1834, and is approximately 3,870 light years from the solar system.
The Dumbbell Nebula appears shaped like a prolate spheroid and is viewed from our perspective along the plane of its equator. In 1992, Moreno-Corral et al. computed that its rate of expansion angularly was, viewed from our distance, no more than 2.3 arcseconds (″) per century. From this, an upper limit to the age of 14,600 years may be ...
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NGC 6530 is a young [8] open cluster of stars in the southern constellation of Sagittarius, located some 4,300 light years from the Sun. [3] It exists within the H II region known as the Lagoon Nebula, or Messier 8, [9] and spans an angular diameter of 14.0′. [5]