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. Tao Wang:

   This is the first time that such a large population of massive galaxies was confirmed during the first 2 billion years of the 13.7-billion-year life of the universe. These were previously invisible to us, this finding contravenes current models for that period of cosmic evolution and will help to add some details, which have been missing until now.

2. Jane Rigby:

   You can’t help but see those thousands of galaxies behind it, really gorgeous.

3. Kotaro Kohno:

   The light from these galaxies is very faint with long wavelengths invisible to our eyes and undetectable by Hubble, so we turned to the Atacama Large Millimeter/submillimeter Array( ALMA), which is ideal for viewing these kinds of things. I have a long history with that facility and so knew it would deliver good results.

4. Tomoharu Oka:

   Investigations of gas motion with radio telescopes may provide a complementary way to search for dark black holes, the ongoing wide area survey observations of the Milky Way with the Nobeyama 45-m telescope and high-resolution observations of nearby galaxies using the Atacama Large Millimeter/submillimeter Array (ALMA) have the potential to increase the number of black hole candidates dramatically.

5. Marshall Perrin:

   The images are focused together as finely as the laws of physics allow, but as we were focusing on those bright stars, we couldn't help but see the rest of the universe coming into focus behind them, to see the more distant stars and galaxies coming into view.

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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