Chapter 20 Cosmology - Astronomical distances
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15 Terms
Astronomical numbers
the astronomical unit - AU ( average distance from earth to sun )
150 million km/ 1.5×10^11m
what is the astronomical unit most often used for
to express the average distance between the sun and other planets in the solar system
what is a light year
the distance travelled by light in a vacuum in a time of one year
distances to some objects visible in the sky
professional astronomers prefer to measure angles not in degrees but in what??
arcminutes and arcseconds
how many arc minutes are in 1 degree
60
how many arc seconds are in each arc minute
60
1 arc second =?
the parsec is defined as what?
the distance at which a radius of one AU subtends an angle of 1 second
what is stellar parallax
a technique used to determine the distance to stars that are relatively close to the Earth, at distances less than 100pc
parallax is the apparent shift in the position of…
the doppler effect
