# AST final Study Flashcards

inch reflector telescope
Terms Definitions
 Retrograde motion: Venus Cepheid period-lum. relation http://www.google.com/imgres?imgurl=http://outreach.atnf.csiro.au/education/senior/astrophysics/images/binvar/plrelnceph.gif&imgrefurl=http://outreach.atnf.csiro.au/education/senior/astrophysics/variable_cepheids.html&usg=__AOZ81JgyFGht_zdGyGOMZQtaHNQ=&h=339&w=447&sz=10&hl=en&start=0&sig2=VUFGYSW_zlKSRZvXowa-PQ&zoom=1&tbnid=h545JTyZGfGa0M:&tbnh=152&tbnw=200&ei=CbyzTemlI8H50gHp5tmcBQ&prev=/search%3Fq%3DCepheid%2Bperiod%2Bluminosity%2Brelation%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26hs%3DLYY%26sa%3DN%26pwst%3D1%26rls%3Dorg.mozilla:en-US:official%26biw%3D1280%26bih%3D807%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=147&vpy=109&dur=498&hovh=195&hovw=258&tx=121&ty=102&page=1&ndsp=20&ved=1t:429,r:0,s:0 *not sure if right* Freezing in space (kelvin) 160K If spectroscopic luminosity classification gives us an estimated distance to the faint star SAO 47552 of about 3300 light years, then its parallax would be only .001 arseconds The apparent boundary between Earth and sky, which moves as you move, is called the horizon. Venus' surface has two continent sized uplands While the rotation axis of _____________ is only tilted 29 degrees, its magnetic fields are just as strange as its twin's is. Neptune Kuiper torus (belt) of short-period comets just beyond Neptune. Shortest day and longest night.Sunrise and set occurring farthest southLowest position of sun at noon. Winter Solstice When the Earth's umbra completely covers the moon we have a(n) _____ eclipse. total lunar Convergence Zone this is when two plates MEET Intensity A measure of brightness at a particular wavelength Light-year The unit astronomers use to measure distances in space. The PRIMARY reason professional observatories are built on the highest mountain tops is to Reduce atmospheric blurring Condensation the first process that planets grow. The process where PARICALS grow one atom at a time from surrounding gas. This increases the mass of the partical rapidly but becomes less effective as the partical gets too large. Most meteorites are found on the continent of Antarctica. True. chromosphere the layer in the solar atmosphere between the photosphere and the corona The shortest distance across the orbit Minor Axis A unit of length commonly used in astronomy is the meter. Third Cambridge Catalog Quasars are discussed on pages 421-423. During the period from the early 1930s to the early 1960s, hundreds of radio sources were detected with no corresponding visible object. These objects were listed in the Third Cambridge Catalog (referred to as 3C). The source of a protostar's energy is: gravitational contraction Which of the Galilean moons is densest and most geologically active? Io last/third quarter phase btw waning gibbous and waning crescent As a rotating gas cloud contracts, it spins faster True core-collapse supernova results from the internal collapse and violent explosion of a massive star; there is a presence of hydrogen Hydrostatic equilibrium state in which the outward gas pressure force balances the inward force of gravity sunspot a temporary cool region in the solar photosphere created by protruding magnetic fields What is good about keeping out light in the cloud? Dust When the Moon's umbra strikes the Earth, someone under it will experience a(an) total solar eclipse. dark matter Term used to describe the mass in galaxies and clusters whose existence we infer from rotation curves and other techniques, but that has not been confirmed by observations at any electromagnetic wavelength. Properties of Photons the higher the frequency, the higher the energy, the longer the wavelength, the lower the energy Which of these moons are most interesting to exobiologists? Titan and Triton Electromagnetic Wave a wave that consists of electric and magnetic fields that vibrate at right angles to each other Planetary Transit when you can see drops in brightness when a planet passes before a star High Mass Stars upper left, high luminosity and high temperature Provided following are various elements that can be produced during fusion in the core of a high mass main sequence star. Rank these elements based on when they are produced, from first to last. 1. Helium 2. Carbon 3. Oxygen 4. Iron During their main-sequence lives, all stars fuse hydrogen into helium in their cores. During the late stages of their lives, massive stars fuse helium into carbon, and ongoing reactions create successively heavier elements, including oxygen. Iron is the last product of fusion in a massive star's core; iron fusion does not release energy, so the production of iron is the event that provokes the stellar crisis that ends (within seconds) in a supernova. Pluto: Has three moons, one about half of its size. According to our current best theories, which of the following does the universe have? A beginning point in time. all but irregulars Which types of galaxies have a clearly defined spheroidal component? What is the equatorial diameter of the Sun? About 1,000,000 km An FSU student is observing the phases of Venus with his 8 inch reflector telescope, and a UF student is doing the same with a 16 inch reflector telescope. How much more light gathering power does the UF telescope have? 4 times more supernova remnant the debris ejected from a star when it explodes as a supernova. Typically this material is hot gas, expanding away from the explosion at thousands of kilometers or more per second. When a newly forming star is at its greatest luminosity, what is its energy source? Gravitational Contraction Explain this 2:1 resonance Jupiter goes around twice for every time Saturn goes around, which created a dangerous lineup The surface of Mercury is most accurately described as covered with many impact craters. Dust Tail (Type II) part of the comet: produced by dust from the vaporizing ices of the nucleus. It is pushed outward by the pressure of sunlight The atmospheric pressure on Venus is 90 times higher than on Earth Structure of the stellar interior from the center outward fusion zone, radiation zone, convection zone How were the maria formed? Huge rocks crashed into the Moon's surface; molten rock from its interior flooded the large basins that were formed. What do pulsars appear to be? rotating neutron stars immersed in hot gas somewhere on the equator where are you if polaris is on you horizon? The Astronomical Unit is defined as: the average distance between the Earth and the Sun. What is Kepplers 2nd law? A straight line joining the plane and the Sun sweeps out equal areas in any 2 equal intervals of time. Heavy atoms, such as nitrogen, carbon, oxygen, silicon, and iron, are: manufactured in cores of very massive stars At what phase would you expect to find extremely high and low tides? both new and full Moons What is thought to cause Io's volcanism? tidal stresses from both Jupiter and Europa What is the evidence that Mars once had running, liquid water on its surface? Spacecraft observe channels and dry river beds on the Martian surface. Light curves of Type Ib and Ic similar to Type Ia, but dimmer at maximum brightness. Most of the extrasolar planets found so far were detected by noting the Doppler shifts of the star as the planet orbits it from side to side Why is a 1 solar-mass red giant more luminous than a 1 solar-mass main sequence star? Fusion reactions are producing energy at a greater rate in the red giant. Any star's luminosity depends on how much energy it is generating, and the red giant is generating a lot through hydrogen shell buring. Since the sun in entirely composed of gases, why doesn't the Sun collapse? the pressure of the Sun increases as the distance below the photosphere, giving rise to an outward force that exactly balances the force of gravity The Age of Aquarius refers to what? It means that in the future the vernal equinox will occur in a direction in line with the constellation Aquarius due to the precession of the Earth's axis of rotation. Much of the water on Mars is thought to be in a layer of permafrost just below the surface Why are a solar day and sidereal day different? A solar day is measured by a sundial. A sidereal day is the true rotational period of the Earth.
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