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 Which single major problem perhaps puzzles astronomers the most as they attempt to interpret the properties and behavior of clusters of galaxies?

Associate Dorothea Dix with

In her “Cult of Domesticity,” this woman argued that the “women’s sphere” was in the home

The Seneca Falls Convention primarily dealt with this issue

Transcendentalism

The “Wilmot Proviso” sought to

The two major immigrant groups that came to the United States in the 1840s-1850s were from

The Civil Rights Act of 1866

In 2004 a blazar of 10 billion solar masses was discovered at a distance of 12.5 billion ly.  What was particularly intriguing about this discovery?

An orbiting disk of matter spiraling in towards a black hole is called what?