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ACTIVITY 1 Directions: Unscramble the letters of each word related to the study of general relativity. PEEMCASIT VARGYIT NWIKGHA CBAKLLHEO ECINOCARLETA EVN QECLIE UA LEPLEIS ACTIVITY 2 Directions: Match the following descriptions to the words you have formed in Activity 1 and write your answer on the space provided. 1. This is the shape of Mercury's orbit. 2. According to this principle, gravity and acceleration are the same. 3. This scientist studied the behavior of black holes and formulated many theories about them. 4. This is composed of the first four physical dimensions known to man. 5. The general theory of relativity mainly explains this natural phenomenon. 6. According to general relativity, the concept of gravity is equal to this concept 7. This is a massive celestial body that sucks up nearby objects due to its very strong gravitational force. Directions: Modified true or false. Write TRUE if the statement is true, if it is false, write the correct term that should replace the underlined word to make the statement correct. 1. Albert Einstein believes that a black hole is the final stage of a massive star's life, but he proposes that they can continue to evolve by evaporating and giving off radiation. 2. According to the principle of equivalence, no experiment can be performed that could distinguish between a uniform gravitational field and an equivalent uniform acceleration. 3. The increase in wavelength of light proceeding outward from a massive source is called the gravitational blueshift. 4. According to Newton, gravity was a force while according to Einstein, gravity is a curvature. 5. When a black hole dies, it would cause a violent explosion that gives off a tremendous amount of gamma radiation. ACTIVITY 2 Directions: Answer the following essay questions in 2-3 sentences. 1. If astronomers cannot see black holes, how did they know it exists? 2. What is the main difference between special and general relativity