The age of the whole Galaxy has been found from studies of its oldest stars in the ________ clusters that orbit in the Halo
Fill in the blank(s) with correct word
globular
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Current statistical evidence suggests that Earth-sized planets orbiting in the habitable zone are
A) extremely rare. B) likely to exist around at least about 20% of all stars. C) found around virtually all stars.
While many elemental spectral lines are visible, almost all molecular lines lie in the ________ portion of the spectrum, since they are at much lower energy
A) infrared B) radio C) X-ray D) ultraviolet E) visible light
A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
a. 15 mm b. 12 mm c. 18 mm d. 24 mm e. 8.5 mm
The outer core is thought to be molten because it
A) is denser than the inner core. B) will not transmit P-waves. C) is made of iron and nickel. D) will not transmit S-waves.