There are 5 "important" main ones
1. Pinning down the age of the universe
2. Seeing galaxies in the early universe
3. New moons of Pluto
4. Understanding seasons on other planets and 5. Exoplanet science
5. Exoplanet science
Pinning down the age of the universe. ...
Seeing galaxies in the early universe. ...
New moons of Pluto. ...
B) Westward expansion added to the growing conflict between "free" and "slave" states before the Civil War.
C) Westward expansion led to an economic "boom" in the Midwest, as new cities and markets were connected by rail and canals.
D) Westward expansion led to increased numbers of slaves in the west, as southern cotton planters sought new lands to make greater profits.
Eliminate
Answer: D) Westward expansion led to loss of life and territory for Native Americans and added to the growing conflict between "free" and "slave" states before the Civil War.
Explanation: Of the choices offered, the BEST statement regarding the negative consequences of westward expansion in the years before the Civil War is that Westward expansion led to loss of life and territory for Native Americans and added to the growing conflict between "free" and "slave" states before the Civil War.
B) Monroe Doctrine and Northwest Ordinance
C) Gadsden Purchase and Homestead Act
D) Missouri Compromise and compromise of 1820