Why does the Sun's image look distorted in shape at sunset?
answer
The distortion arises because of the way air affects the paths of light.
question
Suppose you have a camera attached to a telescope, and you want to record an image of a faint galaxy. Which of the following will help the most?
answer
a lot of pixels and a long exposure time
question
Suppose you have two small photographs of the Moon. Although both look the same at small size, when you blow them up to poster size one of them still looks sharp, whereas the other one becomes fuzzy (grainy) looking. Which of the following statements is true?
answer
The one that still looks sharp at large size has better (smaller) angular resolution than the one that looks fuzzy.
question
The angular separation of two stars is 0.1 arcseconds and you photograph them with a telescope that has an angular resolution of 1 arcsecond. What will you see?
answer
The photo will seem to show only one star rather than two.
question
How does the light collecting area of an 8 meter telescope compare to that of a 2 meter telescope?
answer
The 8 meter telescope has 16 times the light collecting area of the 2 meter telescope.
question
Which of the following best describes why radio telescopes are generally much larger in size than telescopes designed to collect visible light?
answer
Getting an image of the same angular resolution requires a much larger telescope for radio waves than for visible light.
question
Which of the following studies is best suited to astronomical observations that fall into the category called time monitoring?
answer
Studying how a star's brightness varies over a period of 3 years.
question
The stars in our sky twinkle in brightness and color because of ______.
answer
turbulence in the Earth's atmosphere
question
The Chandra Xray Observatory must operate in space because...
answer
X rays do not penetrate Earth's atmosphere
question
Why can't Xray and gamma ray telescopes use the same designs as visible light telescopes?
answer
X rays and gamma rays have so much energy that they cannot be reflected in the same way as visible light.
question
Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?
answer
These things are not forms of light, and therefore can provide different types of information than light about objects that emit them.
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