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The College of The Bahamas ASTR242 Chapter 1 Home Work 1) How long does it take the Earth to complete one orbit around the Sun? A) one year B) one day C) one month D) one week E) The time it takes Earth to orbit the Sun changes significantly from one orbit to the next. 2) The farthest bright galaxies that modern telescopes are capable of seeing are up to A) 1 million light years away. B) 10 million light years away. C) 1 billion light years away. D) 10 billion light years away. E) 1 trillion light years away. 3) Earth is made mostly of metals and rocks. Where did this material come from? A) It was produced in the Big Bang. B) It was created by chemical reactions in interstellar space. C) It was produced by nuclear fusion and explosive death of a star. D) It was made by our Sun. E) It was made by nuclear fission of uranium and other radioactive materials. 4) Which of the following statements does not use the term light - year in an appropriate way? A) It's about 4 light-years from here to Alpha Centauri. B) It will take me light-years to complete this homework assignment. C) A light-year is about 10 trillion kilometers. D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year. E) The Milky Way Galaxy is about 100,000 light-years in diameter.
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5) Light takes approximately one second to travel from the Earth to the Moon (Recall that the speed of light is 300,000 km/s.). This means that the Moon is approximately A) 1 astronomical unit from the Earth. B) 1 light year from the Earth. C) 3,000 kilometers from the Earth. D) 300,000 kilometers from the Earth. E) twice the distance from the Earth to the Sun. 6) One light - hour is the distance that light travels in an hour. How far is this, in kilometers? (Recall that the speed of light is 300,000 km/s.) A) 300,000 km B) 18 million km C) 100 million km D) 1.08 billion km E) 9.46 trillion km 7) Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at the same time after the Big Bang, which galaxy appears to us as the youngest? A) the galaxy that is furthest from us B) the galaxy that is closest to us C) the galaxy that appears largest to us D) the galaxy that appears bluest to us E) All galaxies would appear to have the same age. 8) Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). Which of the following describes the size and distance of Earth on the same scale? A) Earth is the size of a point about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun.
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