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