1. would stars twinkle if viewed from outer space? a. Yes, because they are actu
ID: 1553896 • Letter: 1
Question
1. would stars twinkle if viewed from outer space?
a. Yes, because they are actually pulsing
b. for telescopes like the hubble space telescope, which lie above Earth's atmosphere, this does not occur.
c. the oceans reflect starlight thus making it appear stars twinkle.
d. the retina of the human eye turns on and off very fast, thus making stars appear to be flashing or twinkling when viewed over a long periond of time
2. How does the speed of light traveling through a medium (such as air or glass) compare to the speed of light in a vaccum?
a. it is the same as the speed of light in a vacuum.
b. it is the same a s the speed of light in a vaccum
c. it is always greater than the speed of light in a vacuum
d. sometimes it is greater than the speed of light in a vacuum, and somethimes it is less, depending on the medium.
Explanation / Answer
1.) Option 'b' is correct answer. Stars twinkle when we see them from earth's surface because we are viewing them through thick layers of turbulent (moving) air in the earth's atmosphere. In case of Hubble space telescope, as they are situated above earth's atmosphere, this phenomenon does not occur.
2.) Speed of light traveling through a medium such as air or glass is always less than that of it's velocity in vacuum, because vacuum is the rarest medium among all mediums so velocity of light is largest in vacuum.
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