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parsec
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parsec

Unit used for distances to stars and galaxies. One parsec is equal to 3.2616 light years, 2.063 × 105 astronomical units, and 3.857 × 1013 km.

A parsec is the distance at which a star would have a parallax (apparent shift in position) of one second of arc when viewed from two points the same distance apart as the Earth's distance from the Sun; or the distance at which one astronomical unit subtends an angle of one second of arc.
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Such bursts would be rare and comefrom long distances, more than 100 megaparsecs away.
Strings that blow bubbles in the cosmos by Thomsen, Dietrick E. / Science News
The presumed black hole resides in the center of the Seyfert galaxy NGC 5548, which lies some 70 megaparsecs or 200 million light-years from earth.
Watching a black hole's diet by Thomsen, Dietrick E. / Science News
5, corresponding to a distance of about 2,000 megaparsecs or 6.
Staring at the poles of the sky; a telescope that looked at the North ... by Thomsen, Dietrick E. / Science News
 
 
 
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