_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra
Fill in the blank(s) with correct word
Seyfert
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The amount of carbon dioxide in Earth's atmosphere has been increasing over the last 50 years because of
a. global warming. b. the growth of the ozone hole. c. the burning of fossil fuels. d. increased energy output from the Sun. e. increased magnetic activity in the Sun.
The ____ is the point on the celestial sphere directly above an observer who can be at any point on the Earth
a. north celestial pole b. south celestial pole c. zenith d. celestial equator e. nadir
Rock definition
What will be an ideal response?
Which method relies on the mass of a dark object revealing its presence?
A) pulsars slowing down irregularly B) temporary brightening of a distant star by a gravity lens C) asteroidal occultations D) stellar eclipses E) ring occultations