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The observable universe contains as many as an estimated 2 trillion galaxies [36] [37] [38] and, overall, as many as an estimated 10 24 stars [39] [40] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth. [41] [42] [43] Other estimates are in the hundreds of billions rather than trillions.
Galaxies range in size from dwarfs with just a few billion (109) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral and irregular. Many galaxies are thought to have black holes at their active centers.
Size (left) and distance (right) of a few well-known galaxies put to scale. The following is a list of notable galaxies.. There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe.
The James Webb Space Telescope zooms in on galaxies of various sizes, colors and shapes. ... The most famous elliptical galaxy is M87, which has up to 2.4 trillion stars. Astronomers recently used ...
Typical galaxies range from dwarfs with as few as ten million [110] (10 7) stars up to giants with one trillion [111] (10 12) stars. Between the larger structures are voids , which are typically 10–150 Mpc (33 million–490 million ly) in diameter.
Galaxies are categorised according to their visual morphology as elliptical, [5] spiral, or irregular. [6] The Milky Way is an example of a spiral galaxy. It is estimated that there are between 200 billion [7] (2 × 10 11) to 2 trillion [8] galaxies in the observable universe.
The two galaxies in the images are situated 326 million light-years from Earth in the constellation Hydra. A light year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km).
This idea would be influential later in the Muslim world. [76 ... The Milky Way is approximately 890 billion to 1.54 trillion times ... devoid of many galaxies, ...