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20 Cards in this Set

  • Front
  • Back
The brightness that a star would have if all stars were the same distance from the earth is ______________ magnitude.
absolute magnitude
Frozen chunks of ice and dust that orbit the sun aare called ____.
comets
When we see the entire sunlit side of the moon, we are viewing the __ ___.
full moon
The term that represents how fast a wave oscillates is ______.
frequency
Rotating stars that produce rapid bursts of radio waves are called ___________.
pulsars
The first man to set foot on the moon was __ ____.
Neil Armstrong
The point on the celstial sphere directly above an observer is called the ___.
zenith
A device that splits light into a spectrum for analysis is a ___.
spectrscope
What do we call an unmanned spacecraft launched specifically to explore the unknown?
space probe
Who developed the law of universal gravitation?
Sir Isaac Newton
What do we call the study of God's creation beyond the atmosphere?
astronomy
What are the two basic kinds of optical telescopes?
1. refracting and
2. reflecting
What type of time is based on the stars?
sidereal time
What are the two points on the ecliptic at which the sun is farthest from the celestial equator?
solstice
In what type of orbit does a satellite follow the direction of the earth's rotation, seeming to hover over one spot on the equator?
geostationary
What is the name of the calendar system which we now use?
Gregorian
What is our year based upon?
The time it takes to revolve around the sun.
Who was the first American to orbit the earth?
John Glenn
What are the two points at which the path of the sun crosses the celestial equator?
equinoxes
Why is winter season shorter than summer season?
As a planet moves closer to the sun, it travels faster; and as it moves farther away, it slows down.