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B Planet composition?

  1. Dec 4, 2016 #1
    When a planet passes through any star, it absorb and transmit certain amount of light by which we can determine planet composition.
    My question is that did stars glare hide or inturupt the wavelength transmitted of reflected by planet?
  2. jcsd
  3. Dec 4, 2016 #2


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    I'm not sure if I understand that question correctly.

    The dominant effect is as simple as a shadow: if the planet is between us and the star, it makes a shadow, so we get a lower light intensity (we still get most light because the planet is smaller than the star, so it doesn't block all light).
    If the planet has an atmosphere, this atmosphere will transmit most wavelengths, but absorb some of them. For those wavelengths, the planet appears to be larger (because the atmosphere is not transparent). The difference between the reduction in light for different wavelengths allows to measure the composition of the atmosphere.
  4. Dec 4, 2016 #3

    Vanadium 50

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    Do you mean "through" or "in front of"?
  5. Dec 4, 2016 #4
    In front of.
  6. Dec 4, 2016 #5
    I am repeating again my question.
    When a planet passes in front of any star; plant absorb and transmit certain amount of light and by Spectroscopy we can find planet compositions.
    So those wavelenghts of planet were hide or inturupted by stars glare?
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