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  1. Million years ago
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    Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to 1,000,000 years (i.e. 1 × 106 years), or approximately 31.6 teraseconds.

    Million years ago - Wikipedia

    en.wikipedia.org
    Mya (unit) In astronomy, geology, and paleontology, mya is an acronym for 'million years ago'. This abbreviation is commonly used to show the length of time before the present or "B.P." (before AD 1950). Specifically, one mya is equal to 10 6 years ago.

    Mya (unit) - Simple English …

    simple.wikipedia.org
    Mya (unit) From Wikipedia, the free encyclopedia In astronomy, geology, and paleontology, mya is an acronym for 'million years ago'. This abbreviation is commonly used to show the length of time before the present or "B.P." (before AD 1950). Specifically, one mya is equal to 10 6 years ago.

    Mya (unit) - Wikiwand

    wikiwand.com
  2. 其他用户还问了以下问题
    What does mya stand for?
    In astronomy, geology, and paleontology, mya or " m.y.a. " is an acronym for million years ago. This abbreviation is commonly used as a unit of time to denote length of time before the present or " B.P. " (before AD 1950). Specifically, one mya is equal to 10 6years ago.

    Mya (unit) - Paleontology Wiki | Fandom

    paleontology.fandom.com
    What does mya mean in astronomy?
    In astronomy, geology, and paleontology, mya or "m.y.a." is an acronym for million years ago. This abbreviation is commonly used as a unit of time to denote length of time before the present or "B.P." (before AD 1950). Specifically, one mya is equal to 106 years ago.

    Mya (unit) - Paleontology Wiki | Fandom

    paleontology.fandom.com
    How many years ago is one mya?
    This abbreviation is commonly used to show the length of time before the present or "B.P." (before AD 1950). Specifically, one mya is equal to 10 6 years ago. Mya is traditionally written in lower case (small letters). It is often replaced in scientific literature by a term based on Latin: Ma (megaannum).

    Mya (unit) - Simple English Wikipedia, the free encyclopedia

    simple.wikipedia.org
    What is the difference between Myr and MA?
    Myr is also used with Mya or Ma. Together they make a reference system, one to a quantity, the other to a particular point in a year numbering system that is time before the present. Myr is deprecated in geology, but in astronomy Myr is standard. Where "myr" is seen in geology, it is usually "Myr" (a unit of mega-years).

    Million years ago - Wikipedia

    en.wikipedia.org
    What is MYR used for?
    Myr is in common use in fields such as Earth science and cosmology. Myr is also used with Mya or Ma. Together they make a reference system, one to a quantity, the other to a particular point in a year numbering system that is time before the present. Myr is deprecated in geology, but in astronomy Myr is standard.

    Million years ago - Wikipedia

    en.wikipedia.org
    What is the difference between Myr and astronomy?
    Together they make a reference system, one to a quantity, the other to a particular point in a year numbering system that is time before the present. Myr is deprecated in geology, but in astronomy Myr is standard. Where "myr" is seen in geology, it is usually "Myr" (a unit of mega-years). In astronomy, it is usually "Myr" (Million years).

    Million years ago - Wikipedia

    en.wikipedia.org
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    https://en.wikipedia.org › wiki › Million_years_ago

    Million years ago - Wikipedia

    Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to 1,000,000 years (i.e. 1×10 years), or approximately 31.6 teraseconds. 展开

    Usage

    Myr is in common use in fields such as Earth science and cosmology. Myr is also used with Mya or Ma. Together they make a reference system, one to a quantity, the other to a particular point in a year numbering system that … 展开

    Debate

    In geology, a debate remains open concerning the use of Myr (duration) plus Ma (million years ago) versus using only the term Ma. In either … 展开

    See also

    • Billion years ago
    • Kyr
    • Megaannum (Ma)
    • Symbols y and yr 展开

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  4. Wikipedia
    https://simple.wikipedia.org › wiki › Mya_(unit)

    Mya (unit) - Simple English Wikipedia, the free encyclopedia

    标记:
    Mya in Geology Lower Case
    Mya Wikipedia
    Mya Meaning in History
  5. Wikiwand
    https://www.wikiwand.com › en › articles › Mya_(unit)

    Million years ago - Wikiwand

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  6. fandom.com
    https://paleontology.fandom.com › wiki › Mya_(unit)

    Mya (unit) - Paleontology Wiki | Fandom

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    Mya
  7. Wikipedia
    https://en.wikipedia.org

    Mya (unit) - Wikipedia

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    Mya Wikipedia
  8. Wikiwand
    https://www.wikiwand.com › simple › Mya_(unit)

    Mya (unit) - Wikiwand

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    Mya in Geology Lower Case
  9. Wikipedia
    https://en.wikipedia.org › wiki › Year

    Year - Wikipedia

    In the Julian calendar, the average (mean) length of a year is 365.25 days. In a non-leap year, there are 365 days, in a leap year there are 366 days. A leap year occurs every fourth year during which a leap day is intercalated into the month …

    标记:
    Gregorian Calendar
    Leap Years
    Orbit Around The Sun
    Tropical Year
  10. Academic Dictionaries and Encyclopedias
    https://en-academic.com › dic.nsf › enwiki

    Mya (unit) - Academic Dictionaries and Encyclopedias

    标记:
    Unit
    Mya in Geology Lower Case
  11. Wikipedia
    https://simple.wikipedia.org › wiki › Miocene

    Miocene - Simple English Wikipedia, the free encyclopedia

    标记:
    Eocene Miocene
    Miocene Animals and Plants
    Miocene Epoch Meaning
  12. Wikipedia
    https://simple.wikipedia.org › wiki › Lower_Triassic

    Lower Triassic - Simple English Wikipedia, the free encyclopedia