Term
| The energy source of stars is primarily associated with |
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Definition
| the reactions of nuclei in the star core |
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Term
| If scientists located a Dyson Sphere, they would find |
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Definition
| something made from a dismantled planet |
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Term
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Definition
| affects the magnetic fields |
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Term
| Which of the following can be said about large stars |
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Definition
| Large stars have a shorter lifetime than smaller stars |
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Term
| At this moment, the sun is producing energy by burning |
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Definition
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Term
| The end products of fusion in the Sun's core are |
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Definition
| helium isotopes, protons, and gamma rays |
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Term
| Approximately how long does it take the energy of the Sun to be transferred from the stellar core to the photosphere |
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Definition
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Term
| Which of the following affects the life of a star? |
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Definition
gravitational force, mass, temperature, fusion process
All of the above |
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Term
| From what part of the electromagnetic spectrum is most of the sun's energy emitted? |
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Definition
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Term
| Which of the following satellite observatories could not detect the presence of a black hole? |
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Definition
| space infrared telescope facility (SIRTF) |
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Term
| Differences in how a star appears in the sky are a function of |
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Definition
the size of the star
how far away the star is from earth
the total energy emitted by the star
the star's apparent brightness
all of the above |
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Term
| Who first showed that the Milky Way is not the only galaxy in the universe |
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Definition
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Term
| The big bang theory and the theory of the steady state universe differ |
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Definition
| in that only the steady state thery lacks a specific beginning for the universe |
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Term
| When astronomers look out at our universe, they see all |
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Definition
| other galaxies moving away from us |
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Term
| Which of the following was not a contribution to cosmology by Edwin Hubble? |
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Definition
| the realization that evidence for the big bang can come from studies of abundances of chemical elements |
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Term
| Hubble's law tells us that |
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Definition
| the distance to other galaxies can be measured by calculating the red shift of the light we receive from them |
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Term
| The most recent "freezing" of the universe involved the creation of |
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Definition
|
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Term
| The redshift surveys of the 1980s |
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Definition
| measured the distance to thousands of galaxies |
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Term
| The discovery of a cosmic microwave background |
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Definition
| gave support to the big bang theory |
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Term
| What were the first three elements formed in the big bang? |
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Definition
| hydrogen, lithium, and helium |
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Term
| According to the current ideas about the origin of the universe, which one of the following forces separated at 10^-43 seconds? |
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Definition
The gravitational force
the electromagnetic force
the strong force
the weak force
All of these forces froze out at the same time |
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Term
| Which wavelength of radiation is associated with our expanding universe? |
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Definition
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Term
| Which of the following is constructed completely from atoms made during the big bang? |
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Definition
| None of the above completely from atoms created during the big bang |
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Term
| According to the big bang theory, what accompanied the freezing of the universe at 10^-35 second after time zero? |
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Definition
| There was a short period of inflation |
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Term
| At what point after the big bang did the elementary particles form? |
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Definition
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Term
| What is the basis for evidence supporting the theory of an open expanding universe? |
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Definition
The laws of gravity
The universe's mass
The proportion of dark matter
a newly discovered superova
All of the Above |
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Term
| Because of research with high energy particle accelerators, scientists have direct experimental checks for the evolution of the universe back to |
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Definition
| 10^-10 second from the beginning |
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Term
| Which statement about dark matter is accepted by most astronomers? |
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Definition
| Dark matter interacts with ordinary matter through a gravitational force |
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Term
| What experimental evidence supports the big bang theory? |
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Definition
cosmic microwave radiation
abundance of lithium, hydrogen, and helium
C and D |
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Term
| Anti matter is fairly rare in the universe because |
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Definition
| laboratory research indicates that matter was more plentiful in the early and annihilated the antimatter |
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Term
| The rate at which new stars are formed |
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Definition
| was ten times higher seven billion years ago |
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Term
| Which of the following describe a quasar? |
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Definition
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Term
| Before the first stable nuclei were formed, what was the makeup of the universe |
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Definition
|
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Term
| Evidence for the big bang includes the |
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Definition
-observation that the universe is expanding
-independent evidence that microwave radiation is coming from all directions in space
fat that the average temp of the universe 2.7 kelvin
-abundance of light elements
-all the above |
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Term
| How far away is a galaxy that is moving away from the earth at 100,000 k/s? assume 50 km/s Mps for the Hubble constant |
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Definition
-2000mpc
-more than 6 light years |
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Term
| Why do scientists believe that dark matter does not interact through the electrometric force? |
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Definition
| Because, if it did, it would absorb or emit photons |
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Term
| according to the nebular hypothesis, the solar system began as |
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Definition
|
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Term
| which scientist is credited with the discovery of Pluto |
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Definition
|
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Term
| if only Newtons laws of motion were applied to the solar system |
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Definition
-Venus's orbit could be the reverse of earths orbit
-earths moon could rise in the West and Set in the East
-Mars orbit could be perpendicular to Jupiter's orbit
-Saturns rings could be at random angles to there current plane |
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Term
| what two elements comprise most of a nebula? |
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Definition
|
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Term
| why are the Jovian planets formed from materials different from the terrestrial planets? |
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Definition
| Gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust" |
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Term
| the birth of a solar system would be like |
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Definition
| thick clouds circling a new star |
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Term
| the earths layered composition is consequences of |
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Definition
| differentiation of materials |
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Term
| the inner core at the center of the Earth |
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Definition
| contains the heaviest elements of the earths mass |
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Term
| In our solar system we say that moons |
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Definition
| have been found orbiting all planets except for Mercury and Venus |
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Term
| the Composition of the Earths Moon is most like |
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Definition
|
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Term
| scientists study meteorites |
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Definition
-because they contain the material from which the solar system was made
-to find out more about how and when the Earth was created
-to find out more about other parts of the solar system |
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Term
| after the earth was formed |
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Definition
| it was bombarded by huge chunks of rock |
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Term
| A comparison of asteroids and terrestrial planets would reveal that both are |
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Definition
| relatively rocky and small |
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Term
| the "big splash" theory of the Moons formation |
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Definition
| states that the Earth was struck by a huge object, causing a large amount of mantle material to be blown into orbit |
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Term
| the early atmosphere on Earth included |
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Definition
-methane
-water vapor
-ammonia
-carbon dioxide
-all the above |
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Term
| what are some health hazards of long space trips |
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Definition
| bone mass is loss increasing the chance of breaks |
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Term
| An astronaut standing on Mars and attempting to look at Jupiter might have there view partly blocked by |
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Definition
|
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Term
| the earths atmosphere has probably been affected by all of the following except |
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Definition
| increased amounts of Hydrogen and helium |
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Term
| Transfer of material from space to earth |
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Definition
| has been measured at 20 metric tons daily |
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Term
| What new astronomical info. resulted from the impact of the comet Shoemaker-Levy on Jupiter in 1994 |
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Definition
| composition of atmosphere beneath the planets surface |
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Term
| what was accomplished by Voyager 1 and Voyager 2 |
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Definition
| assessment of the outer Solar system environment |
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Term
| How can meteor showers be predicted |
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Definition
| Meteors are in known orbits around the sun after comets |
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Term
| which of the following characteristics does the Earth Share with all other bodies in the solar system |
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Definition
| gravitationally bound to the Sun |
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