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28 Cards in this Set

  • Front
  • Back
The search for knowledge that can be used to explain or predict natural phenomena in a way that can be confirmed by rigorous observation/ experimentation.
Scientific Theory
A model of some aspect of nature that has been rigorously tested and has passed all tests to date
Astronomical Unit
150 million kilometers.
Light Year
The distance that light can travel in 1 year, 9.46 trillion km.
Approximately equal to 3.26 light years, the distance to an object with a parallax angle of 1 arcsecond
SI meter
Distance light travels in 1/299792458 of a second
What is the distance a star must be for parallax to be 1 arc second?
1 parsec
Duration of 9129631770 periods of radiation given off by hyperfine transition of cesium-133
Scientists want to find a replacement for the
The kilogram is
a standard mass located in France =(
Our sun and stars of the local solar neighborhood orbit the center of the milky way galaxy every
230 million years
The apparent shifting of an object against the background, due to viewing it form different positions
A region of the sky
Celestial Sphere
Imaginary sphere on which objects in the sky appear to reside when observed from Earth
Celestial equator
The extension of Earth's equator onto the celestial sphere
The sun's apparent annual path among the constellations
Boundary that divides what we can see from what we cannot see
Analogous to latitude, but on celestial sphere
right ascension
Analogous to longitude, but on the celestial sphere
Visible above the horizon
The angular north-south distance between the Earth's equator and a location on the Earth's surface
Angular east west distance between the primed meridian and a location on earth's surface
Summer Solstice
Refers both to the point on the clestial sphere where the ecliptic is farthest nort of the celestial equator and the moment in time when the Sun appears at that point each year
sidereal day
The time of 23 hrs 56 min 4.09 sec between successive appearances of any particular star on the meridian; essentially the true rotation period of earth
The point directly overhead, which has an altitude of 90 degrees
winter solstice
1. Point on celestial sphere where the ecliptic is farthest south of the celestial equator
2. Moment in time when Sun appears at that point each year
vernal equinox
Spring Equinox
The point in Pisces on the celestial sphere where the ecliptic crosses the celestial equator
autumnal equinox
The point in Virgo on the celestial sphere where the ecliptic crosses the celestial equator