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A galaxy is a system of ... For comparison, ... Different components of near-infrared background light detected by the Hubble Space Telescope in deep-sky surveys [191]
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.
The sizes and masses of many of the moons of Jupiter and Saturn are fairly well known due to numerous observations and interactions of the Galileo and Cassini orbiters; however, many of the moons with a radius less than ~100 km, such as Jupiter's Himalia, have far less certain masses. [5]
The universe is all of space and time [a] ... Many of the stars in a galaxy have planets. ... For comparison, the diameter of a typical galaxy is 30,000 light-years ...
The following well-known stars are listed for the purpose of comparison. Antares (α Scorpii A) 680 [66] AD Fourteenth brightest star in the night sky. [67] Widely recognised as being among the largest known stars. [19] Betelgeuse (α Orionis) 640, [68] 764 +116 −62, [69] 782 ± 55 [70] AD & SEIS Tenth brightest star in the night sky. [67]
The find, announced Wednesday, can help explain how solar systems across the Milky Way galaxy came to be. A six-planet solar system in perfect synchrony has been found in the Milky Way Skip to ...
Comparison of the night sky with the night sky of a hypothetical planet within the Milky Way 10 billion years ago, at an age of about 3.6 billion years and 5 billion years before the Sun formed. [261] Globular clusters are among the oldest objects in the Milky Way, which thus set a lower limit on the age of the Milky Way.
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.