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Spiral galaxy. Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae[1] and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.
Types of Galaxies Scientists sometimes categorize galaxies based on their shapes and physical features. Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them. Spiral Galaxies Our Milky Way is one example of a broad class of galaxies […]
Jan 8, 2020 · There are currently 3 classifications of classical spiral galaxies and another 3 for barred spiral galaxies: 1. Spiral galaxy type A – abbreviation Sa – they have a big central bulge and smooth, broad spiral arms. Around 2% of the mass of Sa spiral galaxies is present in the form of gas and dust.
Spiral Galaxies - NASA. NASA Reveals Prototype Telescope for Gravitational Wave Observatory. NASA Selects Crew for 45-Day Simulated Mars Mission in Houston. Risk of Reduced Cardiorespiratory and Musculoskeletal Fitness. Risk of Injury and Compromised Performance from Extravehicular Activity (EVA) Amendment 62: New Opportunity: A.61 INSPYRE ...
Nov 19, 2018 · One of the largest known spiral galaxies is NGC 6872, which is 522,000 light-years across from the tips of its outstretched spiral arms — that's about 5 times the size of the Milky Way.
The most widely used classification scheme for galaxies is based on one devised by Edwin P. Hubble and further refined by astronomer Gerard de Vaucouleurs. It uses the three main types: Spiral. Elliptical. Irregular. then further breaks them down by specific characteristics (openness of spirals, size and extent of bars, size of galactic bulges).
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There are four distinct types of galaxies in the universe, elliptical, spiral, barred spiral, and irregular. Although these are the four main types, there are various types of galaxies and the way in which they are classified is by their shape. A galaxy is a cluster of stars, gas, and dust that are kept together by the force of gravity.
