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Chapter 6-12 - Flashcards

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Class:ASTR 1400 - Solar System Astronomy
Subject:ASTRONOMY
University:Texas Tech University
Term:Spring 2010
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Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes? the 2 stars will look like a single point of light.
What do we mean by the "diffraction limit" of a telescope it is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion
Spectral Resolution it is a measure of how close 2 spectral lines can be distinguished.
Name 2 principal advantages of telescopes over eyes. telescopes can collect far more light with far better angular resolution
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"Diffraction Limit" of a telescope it is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion.
Spectral Resolution it is a measure of how close two spectral lines can be distinguished.
Light Pollution refers to light used for human activities that brightens the sky and hinders astronomical observations.
What causes stars to twinkle? bending of light rays by turbulent layers in the atmosphere.
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what is an artificial star? a point of light in the earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations
which wavelengths regions cannot be studied with telescopes on the ground? ultraviolet X-Rays
In what part of the electromagnetic spectrum do the biggest telescopes on Earth operate? Radio
the largest telescope, created by radio interferometry, is the size of..? the earth
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In what wavelength range was interferometry first used? Radio
Interferometry a telescopic technique in which two or more telescopes are used in tandem to produce much better angular resolution than the telescopes could achieve individually.
How does the suns mass compare with that of the planets? it is a thousand times more massive than all the planets combined.
Where does Nuclear Fusion occur in the Sun? in its core
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The most metal rich planet is... Mercury
What planet other than Earth, has visible water ice on it? Mars
Aerobraking the technique of using a planetary atmosphere to change the orbit of a spacecraft.
The planet closest to the size of Earth is... Venus
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What are the main constituents of the Jovian planets? hydrogen and helium
Where are most of the known asteroids found? between the orbits of Mars and Jupiter
Astronomers estimate the total number of comets in the solar system to be 1 trillion
How do asteroids differ from comets? asteroids are rocky bodies and denser than the comets, which are made of icy material
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What is the densest planet in the solar system? Earth
where did the elements heavier than hydrogen and helium come from? they were produced inside stars
What happened during the accretion phase of the early solar system? particles grew by colliding and sticking together
What percent of the solar nebula's mass is hydrogen and helium gas? 98%
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What kind of material in the solar nebula could remain solid at temperatures as high as 1,500K metals
"Frost Line" of the solar system the distance from the Sun where temperatures were low enough for hydrogen compounds to condense into ices, between the present-day orbits of Mars and Jupiter.
What has not been detected around other stars in the galaxy terrestrial planets
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 Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes?the 2 stars will look like a single point of light.
 What do we mean by the "diffraction limit" of a telescope it is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion
 Spectral Resolution it is a measure of how close 2 spectral lines can be distinguished.
 Name 2 principal advantages of telescopes over eyes. telescopes can collect far more light with far better angular resolution
 "Diffraction Limit" of a telescope it is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion.
 Spectral Resolution it is a measure of how close two spectral lines can be distinguished.
 Light Pollution refers to light used for human activities that brightens the sky and hinders astronomical observations.
 What causes stars to twinkle?bending of light rays by turbulent layers in the atmosphere.
 what is an artificial star?a point of light in the earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations
 which wavelengths regions cannot be studied with telescopes on the ground?ultraviolet
X-Rays
 In what part of the electromagnetic spectrum do the biggest telescopes on Earth operate?Radio
 the largest telescope, created by radio interferometry, is the size of..?the earth
 In what wavelength range was interferometry first used?Radio
 Interferometry a telescopic technique in which two or more telescopes are used in tandem to produce much better angular resolution than the telescopes could achieve individually.
 How does the suns mass compare with that of the planets?it is a thousand times more massive than all the planets combined.
 Where does Nuclear Fusion occur in the Sun?in its core
 The most metal rich planet is...Mercury
 What planet other than Earth, has visible water ice on it?Mars
 Aerobrakingthe technique of using a planetary atmosphere to change the orbit of a spacecraft.
 The planet closest to the size of Earth is...Venus
 What are the main constituents of the Jovian planets?hydrogen and helium
 Where are most of the known asteroids found? between the orbits of Mars and Jupiter
 Astronomers estimate the total number of comets in the solar system to be 1 trillion
 How do asteroids differ from comets?asteroids are rocky bodies and denser than the comets, which are made of icy material
 What is the densest planet in the solar system?Earth
 where did the elements heavier than hydrogen and helium come from?they were produced inside stars
 What happened during the accretion phase of the early solar system? particles grew by colliding and sticking together
 What percent of the solar nebula's mass is hydrogen and helium gas?98%
 What kind of material in the solar nebula could remain solid at temperatures as high as 1,500K metals
 "Frost Line" of the solar systemthe distance from the Sun where temperatures were low enough for hydrogen compounds to condense into ices, between the present-day orbits of Mars and Jupiter.
 What has not been detected around other stars in the galaxyterrestrial planets
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