2007-05-24 02:44:45 · 9 answers · asked by pfirrmanator 1 in Science & Mathematics ➔ Geography
It isn't defined as a specific amount of time like a milenium is a 1000 years or a decade is ten years.
In general usage, an eon (sometimes spelled aeon) is a period of time arbitrarily designated by humans. Geologists refer to an eon as the largest subdivision of time on the geologic time scale. For example, the Phanerozoic Eon, which is about 550 million years long, covers the period of time during which animals with hard shells that fossilize would have been abundant.
2007-05-24 02:51:38 · answer #1 · answered by Brian D 4 · 0⤊ 0⤋
There is no real answer as the units do not measure the same thing. Eons are a measure of time and light years are a measure of distance. An eon is a billion (thousand thousand) years, although it can be used loosely to refer to any large time. A geological eon is approximately 500 million years or longer and denote major geological changes on Earth. There have been 4 eons so far: Hadean (or Priscoan), Archean, Proterozoic, and Phanerozoic. A light year is the distance light travels in one year, approximately 9.46 x 10^12 km.
2016-05-21 11:12:42 · answer #2 · answered by ? 2 · 0⤊ 0⤋
You know.. I searched this for you and I don't believe there is an actual answers. It seems to be that an Eon can be anywhere from 1-5 billion years! So, I am guessing they must start and stop by some other means such as evolution of the world.
2007-05-24 02:50:44 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Geological eons are not set by certain intervals but by significant events such as the emergence of multicellular creatures.
Hadean Eon: 4.5 billion years ago to 3.8 billion years ago
Archean Eon 3.8 billion years ago to 2.5 billion years ago
Proterozoic Eon: 2.5 billion years ago to 550 million years ago
Phanerozoic Eon: 550 million years ago to present
2007-05-24 02:50:25 · answer #4 · answered by gebobs 6 · 1⤊ 0⤋
1000
2007-05-24 02:49:05 · answer #5 · answered by Anonymous · 0⤊ 1⤋
e·on Pronunciation[ee-uhn, ee-on] Pronunciation Key -
–noun
1. an indefinitely long period of time; age.
2. the largest division of geologic time, comprising two or more eras.
3. Astronomy. one billion years.
2007-05-24 02:49:44 · answer #6 · answered by Renegade_X 3 · 0⤊ 0⤋
its a figure of speech used to tell for a very long period of time.
2007-05-24 09:28:17 · answer #7 · answered by Anonymous · 0⤊ 0⤋
I think it´s 1000 or more....
2007-05-24 02:51:52 · answer #8 · answered by carlsahlsten 1 · 0⤊ 0⤋
a million?
2007-05-24 06:45:25 · answer #9 · answered by wolverine205 3 · 0⤊ 0⤋