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The first from the rest of the notes is a discussion about the discovery of gravitational waves in 2015 on September 14th by the Virgo experiment. This discovery was significant because it was the first time that gravitational waves had been directly observed, even though scientists had predicted their existence. Gravitational waves are moving ripples in space-time caused by violent cosmic events such as collisions between black holes. Despite detecting the signal, the Virgo machine was able to measure the masses of the black holes, which amounted to 62 times the mass of the sun. The second section discusses an incident during a space mission that occurred in October 1986, when the space shuttle Challenger exploded just 73 seconds after launch due to the failure of an O-ring seal in cold temperatures. Richard Feynman, a renowned scientist, played a crucial role in investigating the cause. The third section talks about how models in science can help us understand and predict complex systems. It uses the example of the water cycle and how scientists can build models of system behavior to predict the movement of water. The fourth section deals with the study of distant galaxies using telescopes and the limitations of capturing images of Earth. The fifth section discusses the concept of space curvature according to Einstein's general theory of relativity. It explains that mass or energy deforms space, which causes light to travel in a curved path. The last section is about the discovery and interpretation of gravitational waves.