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“years”
(these words have become a part of the English language over recent years)
(the challenges that face people in their later years)
Word Entries containing the term:
“years”
light-year, light-years; light year, light years
The distance traveled by a beam of light in a vacuum in one year, approximately 9.46 trillion (million million) kilometers or 5.99 trillion miles.
An an average speed of 186,291 miles or 299,792 kilometers, per second; which equals approximately 5.88 trillion miles or 9.4607 trillion kilometers, or 63,246 astronomical units.
The light-year is also divided into light-minutes and light-seconds; for example, the moon is 1.3 light-seconds from the earth; the sun is 8.3 light-minutes away from the earth.
Although a light-year is a measurement of distance and not time, it does imply time; such as, the light from a star that is ten light-years from the earth takes ten years to reach the earth; so, an observer on earth is seeing the star as it appeared ten years ago.
This entry is located in the following units:
Astronomy and related astronomical terms
(page 14)
Measurements and Mathematics Terms
(page 7)
ya (or) years ago
In archeological dating, dates are measured from 1950, the period when radiocarbon dating became a practical tool in the archeologists arsenal.
This entry is located in the following unit:
Archeology, Archaeology
(page 7)