A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy
Fill in the blank(s) with correct word
Seyfert
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What processes are involved in the sunspot cycle?
A) gravitational contraction of the Sun B) wave motions in the solar interior C) variations of the solar thermostat D) the winding of magnetic field lines due to differential rotation E) the interaction of the Earth's magnetic field with that of the Sun
The expansion of the universe is due to the
A) motion of galaxies through space B) expansion of space within galaxies C) expansion of stars within galaxies D) expansion of space between galaxies
Of the normal matter in the Milky Way, the vast majority of the mass is in the form of gas and dust.
Answer the following statement true (T) or false (F)
Which of the following is TRUE?
A) Visible light makes up the greatest part of the electromagnetic spectrum. B) In a vacuum, electromagnetic waves all travel at the same speed, the speed of light. C) Ultraviolet light has the shortest wavelength of any electromagnetic wave. D) A blackbody emits all its radiation at a single wavelength or frequency. E) Electromagnetic waves cannot travel through empty space.