In the TED Talk "My Search for Proof Aliens Exist" by Avi Loeb, the speaker uses several pieces of evidence and data to support his thesis about the existence of extraterrestrial life, particularly focusing on the interstellar object 'Oumuamua.
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Astronomical Observations: Loeb discusses the observations made by telescopes that detected 'Oumuamua as it passed through our solar system. He highlights its unusual shape, speed, and trajectory, which deviates from what one would expect from a typical comet or asteroid.
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Scientific Principles: He references the laws of physics and the behavior of objects in space to argue that 'Oumuamua's characteristics cannot be easily explained by natural phenomena alone. This includes its acceleration and lack of a visible cometary tail.
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Comparison with Known Objects: He contrasts 'Oumuamua with known celestial objects, pointing out that its properties were significantly different, which raises questions about its origin.
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Technological Limitations: Loeb discusses the limitations of current astronomical technology, arguing that just because we haven't observed something doesn't mean it doesn't exist. He emphasizes the importance of being open to new interpretations of data.
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Historical Context: He references historical instances of resistance in science to new ideas, suggesting that the scientific community should not be closed-minded about the possibility of extraterrestrial life.
As for the persuasiveness of Loeb’s use of logos, many viewers might find his arguments compelling due to the logical structure of his reasoning, the reliance on astronomical evidence, and the challenge he poses to conventional thinking. However, some critics may argue that while his points are intriguing, they still require further empirical evidence to firmly establish the existence of extraterrestrial life. Ultimately, the effectiveness of his logos would depend on the audience's prior beliefs and openness to new ideas.