Maarten Schmidt found the spectral lines were high redshift (had their emission lines shifted toward longer, redder wavelengths by the expansion of the Universe)
<span>The puzzle about quasar spectra, which was finally solved by Maarten Schmidt, was </span><span>the brightest known quasar</span>.
Answer:
B) If one country falls to communism, its neighbors are also likely to do so.
Explanation:
This fear of communism spreading was due to America's rivalry with the Soviet Union after World War II. This era of competition for global influence and power is known as the Cold War. During this time, the US worried about the spread of communism and the domino theory.
To prevent this domino theory from taking place, the US government adopted a policy of containment. Containment was focused on stopping the spread of communism to new countries. This is one of the reasons why the US would get involved in the Korean and Vietnam Wars.
The correct answer is C) developing of irrigation methods.
One characteristic of the Aztec Empire was the developing of irrigation methods.
The Aztec Empire was a dominant tribe in Mesoamerica in the 1500s. Mesoamerica is the vast region from the center of Mexico until the region of Oaxaca and part of Tabasco states. The Aztec people were fierce warriors that conquered other tribes such as the “Tlaxcaltecas” and the “Cholultecas”. The Aztecs developed irrigation methods, as well as constructed floating gardens called “Chinampas” that still today are used in the suburb of Xochimilco, southside Mexico City.
It was provoked by a tax on whisky, and was the first serious challenge to federal authority. Collection of the tax met violent resistance, but when President Washington called out the militia, the rebellion collapsed.
Answer:
The Portuguese
Explanation:
The earliest Europeans to set foot on the land were the Portuguese in the 15th century (1471).