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[answered] Because of precession, Earth's axis now points toward


Because of precession, Earth?s axis now points toward the star Select one:

a. Polaris, but 5,000 years ago Earth?s axis pointed toward Thuban.b. Thuban, but 5,000 years ago Earth?s axis pointed to Polaris.c. Proxima Centauri, but 5,000 years ago Earth?s axis pointed to Vega.d. Polaris, but 5,000 years ago Earth?s axis pointed to Vega.e. Vega, but 5,000 years ago Earth?s axis pointed to Thuban.


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Galileo?s telescopic discovery of moons orbiting Jupiter was important because it showed Select one:

a. that the universe could contain centers of motion other than Earth.b. that Earth could move in an orbit and not leave the moon behind.c. that Earth was the only planet with a single moon.d. a & b.e. none of the above.


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The resolution of radio telescopes has been improved by Select one:

a. spectrographs.b. charge-coupled devices.c. photometers.d. interferometers.e. amplified receivers.


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The resolving power of an optical telescope with a diameter of 232 cm is Select one:

a. 0.05 arc seconds.b. 232 arc seconds.c. 2.32 arc seconds.d. 5 arc seconds.e. 11.5 arc seconds.


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The celestial sphere is divided into two equal halves by a great circle called the Select one:

a. horizon.b. line of seconds of arc.c. parallels of latitude.d. celestial daily motion.e. celestial equator.


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The book ?De Revolutionibus Orbium Coelestium? Select one:

a. describes how Galileo?s observations and Kepler?s calculations proved the Copernican theory.b. describes the construction of Galileo?s telescope and his observations.c. is a dialog written to convince the general public of the merits of the Copernican theory.d. first described the Copernican theory.e. describes the Tychonian theory.


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The instrument that can record the image of a faint object in the least amount of observing time is the Select one:

a. human eye.b. photographic plate.c. photometer.d. charge-coupled device (CCD).e. spectrometer.


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The two types of electromagnetic radiation to which our atmosphere is?MOST?transparent are the Select one:

a. X rays and ultraviolet radiation.b. infrared radiation and radio waves.c. visible light and radio waves.d. gamma rays and visible light.e. radio waves and ultraviolet radiation.


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The speed of light is 3.0 x 105?km/s, and it takes light 1.3 seconds to travel from the moon to Earth. From this information, what is the distance to the moon? Select one:

a. 390,000 kmb. 230,000 kmc. 3.9 kmd. 2.3 kme. 4.3 x 105?km


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The magnitude scale Select one:

a. originated just after the telescope was invented.b. can be used to indicate the apparent intensity of a celestial object.c. was devised by Galileo.d. is no longer used today.e. was used to determine the rate of precession.


 


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