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59 Cards in this Set
- Front
- Back
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The hubble law states that further a galaxy is away the.......it appears to be moving from us. |
Faster |
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Our local group of galaxies is a ..... galaxy cluster |
Poor |
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The milky way is currently colliding with the ....... galaxy. |
Sagittarius |
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The engulfing of one galaxy by another is called..... |
Cannibalism |
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A galaxy that interacts with another galaxy causing many hot bright blue stars to be formed is called a ...... galaxy |
Starburst |
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In a high-speed interaction when a smaller galaxy passes through another galaxy almost perpendicular to the disk, disrupting the spinal arms but leaving the nuclear bulge and a circle of stars and gas, ....... is prouced |
Ring |
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The method used to determine the mass of galaxies using the radial velocities of many galaxies in a group is called the ....... method. |
Rotation Curve |
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The halo of a spiral galaxy is dimmer and ..... thanks the disk |
Bluer |
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Which scientist worked with Milton Humalog in the 1920's to measure distance to a number of galaxies using Cepheid variable stars |
Edwin Hubble |
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Which is NOT a good distance indicator for galaxies? |
White dwarfs |
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Which major galaxy classification contains no visible Gass or dust and lacks hot bright stars? |
Elliptical |
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The milky way galaxy is best described as a ..... galaxy |
Barred spiral |
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The large and small megellenic clouds are best described as ..... galaxies. |
Irregular |
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Which major galaxy classification has the greatest variation in size and mass from dwarf to giant? |
Elliptical |
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The most spherical elliptical galaxies would be classified as |
E0 |
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Barred spiral galaxies make up what portion of all spiral galaxies? |
Two-thirds |
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The hubble law compares what two variables? |
Apparent velocity of recession and distance. |
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The most precise measurements of the Hubble constant yield a value of |
70 km/s/Mpc |
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What is the chance that stars from two interacting galaxies will collide? |
Very unlikely |
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Observation of galaxies and clusters of galaxies reveal that our universe is ..... percent dark matter |
80 to 90 percent |
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The spectral lines of quasar so tend to have very .... redshifts |
High |
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Active galaxies vary their energy and brightness over very ..... intervals of time. |
Short |
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The theory that explains all active with a single mechanism is called the .... model |
Unified |
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Rapid fluctuations of quasars show that objects must be very ..... |
Small |
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Quasars were first identified as a star like objects that had peculiar |
Emission spectra |
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The twisted magnetic field around a superman's I've black hole confines the Jets in a narrow beam and causes .... radiation |
Synchrotron |
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Of the following objects, the one that must be a spiral galaxy is a.... |
Seyfert |
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The speed of a very highly redshifted quasar as determined by the relativistic dappled formula is.... |
Less than that determine by the classical formula. |
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Produces the least energy is a... |
Supernova |
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The look-back times of the farthest galaxies and quasar is about .... of the way back to the big bang. |
68 percent |
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Most of the lines in the spectrum of the quasar 3c 273 are caused by.... |
Hydrogen |
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Quasar distances are estimated by |
Parallax |
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Eruptions of supermassive black holes in quasars may have been caused by.... |
Collision or mergers with other galaxies |
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The objects that are detected at the points where the gas of a radio jet hits the extra galactic medium are called.... |
Hot spots |
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The evidence leads modern astronomers to conclude that at the cores of active galaxies are supermassive black holes with masses as high as... |
A billion stars |
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The universe is expanding and .... is expansion. |
Accelerating |
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The property of being uniform in every direction is... |
Isotropy |
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The property of being uniform at every distance is... |
Homogeneity |
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The cosmic background radiation correlates with an apparent black body temperature of ..... |
2.7 K |
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When a particular of matter needs it antimatter counterpart, the two particles. .... each other. |
Annihilate |
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Einstein added a component to his general relativity equations to balance gravity called the ..... constant |
Cosmological |
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The energy that drives the acceleration of the universe but does not contribute to the formation of starlight or the cosmic microwave background radiation is.... |
Dark energy |
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The study of the universe as a whole is called the study of.... |
Cosmology |
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As the falling temperature of the universe after the big bang reached 3000 k, protons were able to capture and HD free electrons to format neutral hydrogen, a process called... |
Recombination |
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The stretching of space-time not only moves the galaxies away from each other, but it ..... the wavelength of protons |
Lengthens |
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The scenario of the universe accelerating faster and faster until it pulls galaxy, stars and eventually, atoms apart is called the big... |
Rip |
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A theory that describes the sudden. Expansion when the universe was very young is called the ..... universe. |
Inflationary |
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The improbability of the universe being balanced near the boundary between an open and closed universe is called the .... problem |
Flatness |
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The universe has.... |
No edge and no center |
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The main reason the night sky is dark is that the universe is .... |
Finite in age |
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Isotropy is the assumption that... |
The universe looks the same in every direction. |
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According to the hubble law, if galaxy A is 10 times more distance than galaxy b, then galaxy A s.... |
Receding 10 times faster than galaxy B |
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The primordial background radiation is observing primarily at.... |
Radio wavelength |
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Of the following groupings of galaxies, the one that is largest in size is the.... |
Filaments and voids |
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The force that is NOT unified with the others in a grand unified theory is the ... |
Gravitational force |
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The type of universe in which the average density is predicted to be greatest is the... |
Closed universe |
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What did Arno Peninsula and Robert Wilson initially think caused the background radiation in their microwave antenna? |
Pigeon droppings |
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The type of universe that will keep expanding forever is... |
An open universe |
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A nuclear particle theory predicts the existence of massive particles that interact weakly with normal matter are classified as.... |
WIMPs |
