Definitions for Galaxies
gal·ax·ies

WiktionaryRate this definition:5.0 / 1 vote

1. galaxiesnoun

   Plural form of galaxy.

WikipediaRate this definition:0.0 / 0 votes

1. galaxies

   A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias (γαλαξίας), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many are thought to have supermassive black holes at their centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant galaxy observed. It has a comoving distance of 32 billion light-years from Earth, and is seen as it existed just 400 million years after the Big Bang. In 2016, using 20 years of images from the Hubble space telescope, it was estimated that there were in total two trillion (2×1012) or more galaxies in the observable universe, and as many as an estimated 1×1024 stars (more stars than all the grains of sand on all beaches of the planet Earth).In 2021, data from NASA's New Horizons space probe was used to revise the earlier estimate to roughly 200 billion galaxies (2×1011),Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years) and are separated by distances on the order of millions of parsecs (or megaparsecs). For comparison, the Milky Way has a diameter of at least 26,800 parsecs (87,400 ly) and is separated from the Andromeda Galaxy (with diameter of about 152,000 ly), its nearest large neighbor, by 780,000 parsecs (2.5 million ly.) The space between galaxies is filled with a tenuous gas (the intergalactic medium) with an average density of less than one atom per cubic meter. Most galaxies are gravitationally organized into groups, clusters and superclusters. The Milky Way is part of the Local Group, which it dominates along with Andromeda Galaxy. The group is part of the Virgo Supercluster. At the largest scale, these associations are generally arranged into sheets and filaments surrounded by immense voids. Both the Local Group and the Virgo Supercluster are contained in a much larger cosmic structure named Laniakea.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Galaxies

   of Galaxy

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Galaxies

   Large aggregates of CELESTIAL STARS; COSMIC DUST; and gas. (From McGraw Hill Dictionary of Scientific and Technical Terms, 6th ed)

How to pronounce Galaxies?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say Galaxies in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of Galaxies in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of Galaxies in Pythagorean Numerology is: 6

Examples of Galaxies in a Sentence

1. Van Dokkum:

   For the age we thought - 10 billion years, we saw the exact number of stars that we expected, so, it turns out our models for this particular age are correct. Now, the next step is to look at younger galaxies and see if they have indeed stronger pulsations which we would predict.

2. Seth Shostak:

   There is estimated to be in our galaxy alone a trillion planets. And we can see 100 billion galaxies, it's believed that one in 10 stars may have a habitable world capable of supporting life.

3. The ESA:

   This is different from the more common collisions in which small galaxies are gobbled up by their larger neighbors.

4. Ray Norris:

   No doubt the SKA telescopes, once built, will find many more ORCs and be able to tell us more about the lifecycle of galaxies, until the SKA becomes operational, ASKAP and MeerKAT are set to revolutionise our understanding of the Universe faster than ever before.

5. Marcel Neeleman:

   The fact that we found the Wolfe Disk using this method, tells us that it belongs to the normal population of galaxies present at early times, when our newest observations with ALMA surprisingly showed that it is rotating, we realized that early rotating disk galaxies are not as rare as we thought and that there should be a lot more of them out there. Thanks to ALMA, we now have unambiguous evidence that they occur as early as 1.5 billion years after Big Bang.

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References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Galaxies
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Galaxies
3. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/Galaxies