1) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.

2) The Hubble Space Telescope, launched in 1990, has provided breathtaking images of distant galaxies and deep space.

3) The study of fossils is called paleontology, and it helps us understand the history of life on Earth and the process of evolution.

4) The Galapagos Islands, located in the Pacific Ocean off the coast of Ecuador, are renowned for their unique and diverse wildlife, including the Galapagos tortoise, marine iguanas, and Darwin's finches. They played a pivotal role in Charles Darwin's theory of evolution.