File:Stellarparallax_parsec1.svg · Wikimedia Commons · See Wikimedia Commons
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Also known as pc, parallax of one second, parallax second
The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, and is defined as the distance at which 1 au subtends an angle of one arcsecond ( of a degree). The nearest star, Proxima Centauri, is about from the Sun: from that distance, the gap between the Earth and the Sun spans slightly less than one arcsecond. Most stars visible to the naked eye are within a few hundred parsecs of the Sun, with the most distant a
AI overview
A parsec is a unit of distance used by astronomers to measure how far away stars and galaxies are from Earth, roughly equal to 3.26 light-years. It's defined using the angle that Earth's orbit makes as seen from distant stars, which allows astronomers to calculate cosmic distances using geometry and observations from different positions in Earth's orbit around the Sun.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Unit.name
- parsec
- Unit.image
- Stellarparallax parsec1.svgclass=skin-invert-image
- Unit.caption
- A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale)
- Unit.standard
- astronomical units
- Unit.quantity
- length/distance
- Unit.symbol
- pc
- Unit.units1
- metric (SI) units
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- ≈
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- imperial US units
- Unit.units3
- astronomical units
via Wikipedia infobox