Which discovery by astronomer Vera Rubin helped prove the existence of dark matter? Galaxies exist outside of the Milky Way.
The expansion of the universe is accelerating.
Galaxies spin faster than they should, based on their visible matter.
Gas giants form farther from the Sun, where temperatures are cooler.

Which of the following is an example of how the transition toward a more global economy affected the sale of goods? a. africa's transition to becoming the largest producer of manufactured goods and establishing a monopoly over trans-atlantic trade b. an increase in the number of countries that adopted isolationist policies to preserve native cultures c. south america's transition away from the production of manufactured goods to a dependency on agricultural products d. the turn away from small trade goods, such as silk and spices, and toward bulk items such as slaves and manufactured goods