The orbital plane of Earth about the Sun is called
the
a)celestial plane.
b)geocentric plane.
c)ecliptic plane.
d)sidereal plane.
c
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A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
Which part of the electromagnetic spectrum would we use to study the relatively cool dust of interstellar space?
A. visible light B. radio waves C. gamma rays D. ultraviolet light E. infrared light
How are interstellar bubbles made?
A) by the collapse of a gas cloud to form stars B) by the rapidly rotating magnetic fields of pulsars C) by the winds of massive stars and supernovae explosions D) by the ejection of planetary nebulae from low-mass stars E) by collisions between the Milky Way and satellite dwarf galaxies
What of these is the largest contributor to the average annual radiation dose? (See Table 25-5 for relevant data.)
a. Exposure during medical procedures. b. Radioactive isotopes of potassium in our bodies. c. Cosmic rays. d. Radon. e. Nuclear power.