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AST Ch 11

Astronomy

QuestionAnswer
The speed of light, symbolized by the letter C, is approximately 186,000 miles per second. Given that there are roughly 33 million seconds in a year (60 x 60 x 24 x 365.25), light can travel about 6 trillion miles in one year (light year)
A "parallax second of arc" is called a parsec (pc)
A parsec is equal to about 3.26 light years
everything we can see with the naked eye is part of the milky way
this french astronomer made a list of fuzzy objects that werent comets charles messier
when comets are far from the sun, they don't have a tail
one way to determine if a fuzzy object is a comet is to see if it moves against the background of the stars
the first messier object, m-1, is really the crab nebula
the messier list objects comprise nebulae, open star clusters, and globular star clusters
at 4.3 LY, the nearest star to us after the sun is rigel kentauris (alpha centauri)
how many stars are in the alpha centauri system? 3
what are the stars in the alpha centauri systems common center of mass barycenter
of the three stars of Alpha Centauri, this red dwarf is closest to us proxima centauri
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