astronomical distance


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astronomical distance

[‚as·trə′näm·ə·kəl ′dis·təns]
(astronomy)
The distance of a celestial body expressed in units such as the light-year, astronomical unit, and parsec.
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Both combinations produce type la blasts like the Tycho supernova (shown), stellar explosions that act as "standard candles" for gauging astronomical distances. Type la supernovas are triggered when white dwarfs gain weight, igniting a thermonuclear reaction that produces a fireball of predictable brightness.
Their brightness is so consistently intense that supernovae have been used as "standard candles" or gauges, acting as yardsticks indicating astronomical distances.Most result from the death of single stars much more massive than the sun.As a star ages, it exhausts its supplies of hydrogen and helium fuel at its core.
"All Type Ia supernovae have the same characteristic luminosity which makes them ideal for measuring astronomical distances. They are used as standard candles by astronomers to determine the distance of celestial objects and have allowed astronomers to measure the distances to galaxies at the edge of the known Universe, providing vital clues into the rate the Universe is expanding.
After a foreward by popular author Timothy Ferris, the text begins with a general discussion of astronomical distances and astrophysical sources, and also touches on catalogs and coordinate systems.
Thank "standard candles." Measuring astronomical distances depends on certain heavenly objects, believed to shine with consistent intensity wherever they exist.
Background information on massive stars and medium stars and activities with subjects such as star life, constellation shapes, nebula terminology, astronomical distances, and pulsars is included.
Washington, June 9 (ANI): Radio astronomers have directly measured the distance to a faraway galaxy, providing a valuable "yardstick" for calibrating large astronomical distances and demonstrating a vital method that could help determine the elusive nature of the mysterious Dark Energy that pervades the Universe.
You give astronomical distances beyond the solar system in light-years, but professional astronomy papers use parsecs.
This CD-ROM version is an "interactive essay on scale." It's an eclectic mix of culture and science that explores scale and design in many aspects, from astronomical distances and periods to patterns that repeat at surprisingly different levels.

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