unitfourassignment4.docx - AST 1002 Horizons in Astronomy...

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AST 1002 Horizons in Astronomy Unit Four Book Assignment 1. Astropedia 12.3: What is the chemical composition of most stars? How does the helium get produced in the Sun and other main-sequence stars and why is it such a rare element on Earth? Stars are composed of around 70% hydrogen, 20 % helium and heavier elements. The Sun, hydrogen is undergoing a constant nuclear reaction, it fuses hydrogen atoms to form helium atoms in their cores. Although helium is so rare on the Earth it is one of the most abundant elements in the solar system. In fact, hydrogen and helium make up the bulk of the Sun and the giant planets. It is unusual that is not that present in Earth. Earth is too low in mass to retain those light gases, they evaporate and scape to space. 2. Astropedia 12.8: Four stars occupy the corners of an H-R diagram. Which one is the largest? red hypergiant stars like VY Canis Majoris Which one is the smallest? white dwarfs like Sirius B and Procyon B Which one is small and cool ? Brown dwarf Which one is large and hot?
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