The branch of astronomy that studies the structure and evolution of the entire universe is called ______________
Fill in the blank(s) with correct word
cosmology
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A lunar eclipse can only occur when the Moon is ____
a. full b. new c. waxing d. waning e. rising
Radioactivity Basics: Suppose that starting with 
, the following sequence of decays occurs: first an alpha decay, then a beta-minus decay, and finally another alpha decay. What isotope is left after each one of the decays?
What will be an ideal response?
How is the energy that powers radio galaxies, quasars, and other active galactic nuclei produced?
A) by matter that has been converted to pure energy by interacting with the jets shot out by a central black hole B) by nuclear fusion near a central black hole C) by matter-antimatter annihilation near a central black hole D) by magnetic fields that trap and accelerate charged particles, which then radiate large amounts of energy E) by gravity, which converts the potential energy of matter falling toward a central black hole into kinetic energy, which is then converted to thermal energy by collisions among the particles of matter
CH3 CONHCH2 CH3 is an example of a(n)
a. amide. b. amine. c. ester. d. carboxylic acid.