Astro 1 Exam 3

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Astro 1 Exam 3 1. What is the general result of the proton proton chain? - ✔✔4h-> He+energy+other products 2. The corona of the sun: - ✔✔Is visible during a solar eclipse 3. In the connecti... ve zone of the sun: - ✔✔Columns of hot gas rise, cool, and descend 4. What part of the sun do we typically see? - ✔✔Photosphere 5. In nuclear fusion, energy is produced because: - ✔✔The mass of the reacting chemicals is larger than that of the products 6. When using different points in the earth's orbit as a baseline for a parallax experiment it is best to do the observations: - ✔✔6 months apart 7. One star is four times farther away than another. The parallax angle of the more distant star is. - ✔✔Four times smaller than that of the nearest star 8. The parallax angle for the star hadar is .010 arcseconds. How far away is hadar? - ✔✔100 pc 9. Put one of your thumbs at arm's length from your face. Now focus on something in the background and look though one eye at a time. What do you notice about your thumb? - ✔✔It appears to move more when it is closer 10. Star A is 4 times as luminous as star B. Star A is 2 times as far away as star B. Which star appears brighter and by how much? - ✔✔The stars appear the same brightness 1. Do you remember what the main sequence means? - ✔✔The curve on the HR diagram where stars of different masses are located while they are converting hydrogen to helium in their cores 2. So the sequence of events for the sun-like star is - ✔✔Stellar nursery, protostar, sun-like star on main sequence, red giant, planetary nursery, white dwarf 3. Stars less massive than the sun will also end their lives as - ✔✔White dwarfs 4. By the way, what is this brown dwarf they are talking about in the bottom row. - ✔✔It is an object with a mass less than 8 percent of the sun, which cannot have enough nuclear reactions in its core to be a star 5. Medium mass stars end as - ✔✔Type II supernova then neutron stars 8. When a star is burning helium in its core and has puffed out its outer layers, it is: - ✔✔A red giant 9. The very highest mass stars will end their lives as - ✔✔Black holes 10. A planetary nebula - ✔✔Is the ejected outer layers of a low-to-intermediate mass star 11. In a high mass star, why does nuclear burning stop at iron. - ✔✔nuclear reactions involing iron do not produce energy 12. What is the density at the center of a black hole? - ✔✔Infintiy 13. Why are things torn apart when they near a black hole? - ✔✔The part of the object close to the black hole feels a greater force 14. Which of the following statement sare true> - ✔✔Nothing can travel faster than the speed of light 15. The event horizon of a black hole is: - ✔✔The minimum distance from which light can escape 16. An "onion skin" shell burning structure, with elements up to iron being produced, develops in: - ✔✔A star more massive than the sun 17. What is at the center of a planetary nebula? - ✔✔The core of a dying star Something that will eventually become a white dwarf 18. How do solar-sized and smaller stars die? About how large are their remnants? - ✔✔They become white dwarks, are about the size of the earth 19. What does not happen when an object approaches a black hole? - ✔✔It quickly gets sucked in even from a large distance 20. How can we meassrue the mass of a black hole? - ✔✔Measure the speed of the orbit of a star in a binary system with the black hole 21. The habitable around the sun includes - ✔✔Earth, and almost venus and mars 22. Now what if the sun were 1.2 times it present mass. What planet/s would be in the zone? - ✔✔Earth and mars 23. Stars that include mercury in their habitable zone are - ✔✔About or a little less than a .75 times the mass of the sun 24. What is the main requirement for a habitable zone? - ✔✔Liquid water 25. A star that is twice the mass of our sun would have a habitbale zone that: - ✔✔Includes mars but not the earth 26. A star that is 75 percent of the mass of our sun would have a h [Show More]

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