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If a telescope with an objective lens of 10-foot focal length is used with an eyepiece of 1/4 inch focal length, the resulting magnification will be...
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480x
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You are on a strange planet. You note that the stars do not rise and set, but circle around parallel to the horizon. Then you travel over the surface of the planet in a straight line for 4500 miles and find that at this new place the stars rise straight up from the horizon in the east and set straight down in the west. The circumference of the planet is...
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18,000 miles
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Orange light is of ______ than violet light.
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lower frequence and longer wavelength
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The horns of the crescent moon ALWAYS point...
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away from the Sun.
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At new moon the Earth would appear to an observer on the moon to be at _____ phase.
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Full
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When Venus has an elongation that is 20 degrees westward from the Sun, it is then visible...
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as a morning star
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What happens in our model of the atom when an emission line is formed?
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An electron moves from a higher energy level to a lower one.
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You live at 40 degrees north latitude. How often is the Sun directly overhead at noon in your hometown?
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Never
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The orbit of the Earth about the Sun defines a plane in space. The orbital plane between the Earth and the Sun is referred to as the...
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ecliptic
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Although the stellar constellations are of very ancient origin, they are still useful to modern astronomers...
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for indentifying stars and designating locations on the sky.
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The first person known to suggest the heliocentric model for the solar system
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Aristarchus
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Wrote a series of books called the Almagest in which the epicycle theory of the solar system is described in great detail.
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Ptolemy
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Discovered the three laws of planetary motion
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Kepler
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Compiled the most accurate set of naked eye positional observations of the planets that had ever been made up to his time (1600 AD)
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Tycho Brahe
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Made a remarkably good estimate of the circumference of the Earth during the second century BC
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Eratosthenes
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Used the orbits and eclipses of the moons of Jupiter to estimate the speed of light
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Roemer
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First used a telescope to observe the heavens in 1610
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Galileo
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Discovered the four large moons of Jupiter by direct observation
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Galileo
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Wrote the book De Revolutionibus Orbium Coelestium published in 1543
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Copernicus
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Formulated the law of gravitation, the laws of motion and the nature of light
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Newton
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constellation with the bright star...
Polaris
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Ursa Minor
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Rigel
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Orion
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Castor
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Gemini
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Betelgeuse
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Orion
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Deneb
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Cygnus
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Altair
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Aquila
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Procyon
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Canis Minor
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Pollux
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Gemini
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Aldebaran
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Taurus
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Sirius
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Canis Major
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The second most abundant element in the Sun
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helium
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The planet that rotates on its axis with a period almost identical to that of the Earth is
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Mars
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Stars at the upper left-hand end of the main sequence have which of these:
long lifetimes
small size
cool temperature
large mass
red color
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large mass
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Which kind of process, as a net result, supplies the energy of our Sun?
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Hydrogen atoms are converted to helium through fusion.
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Suppose you are at the Tropic of Cancer, which has a latitude of 23.5 degrees. The altitude of the north celestial pole as seen from your position is...
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23.5 degrees
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The temperature of the solar photosphere is about
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5800 K
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How many stars of 7th magnitude in a small cluster would it take if the cluster were to appear as bright as a single 1st magnitude star?
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251
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Which is least important to an astronomer for observing stars:
magnifying power
resolving power
ability to photograph or measure for long periods of time
light-gathering power
ability to aim the telescope in different directions
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magnifying power
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An eclipse of the sun can only occur when the moon is at...
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new moon
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Ten parsecs is the standard distance selected for the astronomical scale of...
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absolute magnitudes
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Suppose that the moon is seen in the sky some evening. The next evening, it will have moved...
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to the east
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How many constellations in the night sky are accepted by the IAU?
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88
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Observation of the shift of a star's spectrum toward the red or the blue (Doppler shift) enables us to determine the star's...
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radial velocity
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The differences observed in stellar spectra are due primarily to differences in...
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temperature
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The Zeeman effect describes what changes in spectral lines?
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Line splitting due to intense magnetic fields.
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Shepherd moon of Saturn
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Pandora (or Prometheus)
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moons of Mars
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Phobos and Demos
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Largest rocky surface of any known satellite
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Ganymede
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Pluto's moon
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Charon
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Moon of Neptune with a thin atmosphere
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Triton
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