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Just so we know where we are quiz (10 pts)
Name_____________________
Identify terms
Label each term with the appropriate letter of a definition listed
1. Astronomical Unit (AU)____ 8. precession______
15. magnitude scale______
2. Light Year (ly)_____
9. parallax_____
16. radio telescope______
3. Scientific theory_____
10. rotation______
17. reflecting telescope _____
4. Celestial Equator_____
11. universal law of gravitation ____
5. Celestial Sphere______
12. Resolving Power______
19. electromagnetic radiation_____
6. Ecliptic
13. aphelion_____
20. wavelength______
7. Equinox
14. retrograde motion_____
18. refracting telescope_____
A. A telescope in which the principal light-gathering component is a lens
B. A slow, conical motion of the Earth's axis of rotation caused by the gravitational pull of the Moon and Sun on
the Earth's equatorial bulge.
C. The distance between two successive peaks on a wave.
D. The annual path of the Sun on the celestial sphere; the plane of the Earth's orbit around the Sun.
E. A telescope designed to detect radio waves.
F. The average distance between the Earth and the Sun: 1.5xl08 km.
G. The apparent change in position of an object due to a change in the location of the observer.
H. The astronomical brightness scale.
I. An idea about the natural world that is subject to testing and refinement
J. The point in its orbit where a planet or other solar system body is farthest from the sun.
K. A great circle 90° from the celestial poles (a projection on the celestial sphere of the earths equator.)
L. A telescope in which the principal light-gathering component is a concave mirror.
M. The entire array or family of electromagnetic radiation.
N. The occasional backward (that is, westward) apparent motion of a planet against the background stars as seen
from Earth.
O. The ability of a telescope to reveal fine detail. Depends on the diameter of the telescope objective.
P. Motion around an axis passing through the rotating body.
Q. Newton's law of gravitation, which describes how the gravitational force between two bodies depends
on their masses and separation.
R. Either of two days of the year when the Sun crosses the celestial equator and si therefore directly over the
Earth’s equator. (Two places where the ecliptic crosses the celestial equator).
S. The apparent sphere of the night sky.
T. The distance that light travels in a vacuum in one year
a.
b.
c.
d.
e.
coulomb force
blackbody radiation
interstellar medium
granulation
helioseismology
f.
g.
h.
i.
j.
convection
molecular cloud
hydrostatic equilibrium
Doppler effect
conservation of energy
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1. radiation emitted by a hypothetically perfect radiator
_
2. The fine structure of bright grains covering the sun’s surface, produced by upwelling currents of gas that are
slightly hotter, and therefore brighter, than the surrounding regions, which are flowing downward into the Sun.
_
3. A dense interstellar gas cloud in which atoms are able to link together to form molecules
_
4. Circulation in a fluid driven by heat. Hot material rises and cool material sinks.
_
5. The electrostatic force of repulsion or attraction between charged bodies
_
6. One of the basic laws of stellar structure. The amount of energy flowing out of the top of a shell must equal the
amount coming in at the bottom plus whatever energy is generated within the shell.
_
7. The study of the interior of the sun by the analysis of its mode of vibration
_
8. The change in the wavelength of radiation due to relative radial motion of source and observer.
_
9. The balance between the weight of the material pressing downward on a layer in a star and the pressure in that
layer
_ 10. The gas and dust distributed between the stars.