astro 8 hw

astro 8 hw - of the surrounding stars. c) If a rock were...

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1. a) Iron is special in stellar evolution because it’s the last element (because it’s the most stable) in the element fusion sequence. b) All elements that are heavier than iron are both rare and expensive because stars stop producing elements after iron. 2. a) High-mass stars have several options when considering stellar evolution. After core collapse, they may become a supernova or they can become a neutron star, eventually creating a whole. On the other hand, low mass stars’ lives come to an end after the burnt out core becomes a white dwarf. b) A supernova produced neutrinos that were detected on Earth. 3. a) Black holes are often observed as X-ray sources because their extremely high temperatures are able to emit X-rays. b) Space is considered to be curved near a black hole because the gravitational pull near them is so strong that it’s capable of bending light and also, our view
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Unformatted text preview: of the surrounding stars. c) If a rock were hypothetically thrown into a black hole, it would never reach the Event Horizon. Instead, it would appear suspended in space for the rest of eternity. 4. a) The Population I stars have heavier element abundances, a younger age, and are located on the outskirts of the galaxy. Population II stars, on the other hand, are older, lack heavier elements, and are located toward the center of the galaxy. b) Population I stars are considered to be the youngest stars in the galaxy. These stars are in the main-sequence phase of stellar evolution and are abundant with metals. On the other hand, Population II stars are the oldest stars in the galaxy. They, unlike Population I stars, lack the metallic elements. These observations imply that the galaxy was formed in the center, where the older Population II stars exist today....
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This note was uploaded on 04/24/2008 for the course ASTRO 1 taught by Professor Antonucci during the Spring '08 term at UCSB.

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