SR Vocab Quiz

heliocentric

Although backed by authority and common sense, the geocentric theory did not accurately explain the movements of the sun, moon,and planets. This problem troubled a Polish cleric and astronomer named Nicolaus Copernicus. In the early 1500's, Copernicus became interested in an old Greek idea that the sun stood at the center of the universe. After studying planetary movements for more than 25 years, Copernicus reasoned that indeed, the stars, the earth, and the other planets revolved around the sun. Copernicus's heliocentric theory still did not completely explain why the planets orbited the way they did.

Galileo

An Italian scientist named Galileo Galilei built on the new theories about astronomy. As a young man, Galileo learned that a Dutch lens maker had built an instrument that could enlarge far-off objects. Galileo built his own telescope and used it to study the heavens in 1609.

Scientific Revolution

Beginning in the mid-1500's, a few scholars published works that challenged the ideas of the ancient thinkers and the church. As these scholars replaced old assumptions with new theories, they launched a change in European thought that historians call the Scientific Revolution. The Scientific Revolution was a new way of thinking about the natural world. That way was based upon careful observation and a willingness to question accepted beliefs.

Newton

By the mid-1600's, the accomplishments of Copernicus, Kepler, and Galileo had shattered the old views of astronomy and physics. Later, the great English scientist Isaac Newton helped to bring together their breakthroughs under a single theory of motion. By the time he was 26, he was certain that all physical objects were affected equally by the same forces.

Bacon

Francis Bacon, an English statesman and writer, had a passionate interest in science. He believed that by better understanding the world, scientists would generate practical knowledge that would improve people's lives. In his writings, Bacon attacked medieval scholars for relying too heavily on the conclusions of Aristotle and other ancient thinkers. Instead of reasoning from abstract theories, he urged scientists to experiment and then draw conclusions. This approach is called empiricism, or the experimental method.

Galileo's conflict

Galileo's findings frightened both Catholic and Protestant leaders because they went against the church teaching and authority. If people believed the church could be wrong about this, they could question other church teachings as well. In 1616, the Catholic Church warned Galileo not to defend the ideas of Copernicus. Although Galileo remained publicly silent, he continued his studies.

Galileo's work

In 1632, he published Dialogue Concerning the Two Chief World Systems. This book presented the ideas of both Copernicus and Ptolemy, but it clearly showed that Galileo supported the Copernican theory. The pope angrily summoned Galileo to Rome to stand trial before the Inquisition.

Descartes

In France, René Descartes also took a keen interest in science. He developed analytical geometry, which linked algebra and geometry. This provided an important new tool for scientific research. Like Bacon, Descartes believed that scientists needed to reject old assumptions and teachings. As a mathematician, however, he approached gaining knowledge differently than Bacon. Rather than using experimentation, Descartes relied on mathematics and logic. He believed that everything should be doubted until proved by reason. The only thing he knew for certain was that he existed--because, as he wrote, "I think, therefore I am." From this starting point, he followed a train of strict reasoning to arrive at other basic truths.

Changing Idea: Scientific Method

Old Science: Scholars generally relied on ancient authorities, church teachings, common sense, and reasoning to explain the physical world. New Science: In time, scholars began to use observation, experimentation, and scientific reasoning to gather knowledge and draw conclusions about the physical world.

Galileo at Trial

The pope angrily summoned Galileo to Rome to stand trial before the Inquisition. Galileo stood before the court in 1633. Under the threat of torture, he knelt before the cardinals and read aloud a signed confession. In it, he agreed that the ideas of Copernicus were false.

scientific method

The revolution in the scientific method thinking that Copernicus, Kepler, and Galileo began eventually developed into a new approach to science called the scientific method. The scientific method is a logical procedure for gathering and testing ideas. It begins with a problem or question arising from an observation. Scientists next form a hypothesis, or unproven assumption. The hypothesis is then tested in an experiment or on the basis of data. In the final step, scientists analyze and interpret their data to reach a new conclusion. That conclusion either confirms or disproves the hypothesis.

Bacon & Descartes

The scientific method did not develop overnight. The work of two important thinkers of the 1600's, Francis Bacon and René Descartes helped to advance the new approach. Modern scientific methods are based on the ideas of Bacon and Descartes. Scientists have shown that observation and experimentation, together with general laws that can be expressed mathematically, can lead people to a better understanding of the natural world.

geocentric

This earth-centered view of the universe was called the geocentric theory. The idea came from Aristotle, the Greek philosopher of the fourth century B.C.. The Greek astronomer Ptolemy expanded the theory in the second century A.D. In addition, Christianity taught that God had deliberately placed the earth at the center of the universe. Earth was thus a special place on which the great drama of life unfolded.