Answer:
it was a gateway to the larger west in 1861
One of tycho brahe's major contributions to astronomy was to prove that A comet was outside of Earths atmosphere.
One of tycho brahe's major contributions to astronomy was to prove that A Supernova was much farther away than the planets.
These are his two contributions
It is C. The Secretary of State William Seward argued that the U.S. should buy Alaska because U.S. wants expand, and Alaska had valuable resources.
