How many astronomical unit in 1 gigalight-year? The answer is 63197790929900. We assume you are converting between astronomical unit and gigalight year. You can view more details on each measurement unit: astronomical unit or gigalight-year The SI base unit for length is the metre. 1 metre is equal to 6.6845871226706E-12 astronomical unit, or 1.0577248071986E-25 gigalight-year. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between astronomical units and gigalight years. Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from gigalight-year to astronomical unit, or enter any two units below:
The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length. It is approximately equal to the mean distance between the Earth and Sun. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles).
The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".
One gigalight-year, abbreviation "Gly", is one billion light-years — one of the largest distance measures used. One gigalight-year equals 306.601 million parsecs, or roughly one-thirteenth the distance to the horizon of the observable universe (dictated by the cosmic background radiation). Gigalight-years are typically used to measure distances to supergalactic structures, such as clusters of quasars or the Great Wall.
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