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What are RR Lyrae stars?

Recent research suggests that the rise of political organizations came about because:

What are the components of the spiral galaxy? (CIRCLE ALL THAT APPLY)

Mixed-race South Africans are called:

Chinese radicals, in their political values and goals, would have much in common with American:

Referenda in France recently have been used with regard to:

Under Putin, economic assets have been increasingly concentrated in the hands of:

Since the collapse of the Soviet Union, the Russian military has:

If the spectral lines on a star’s spectra split, what does it mean?  

What direction is tangential motion relative to earth?