Check whether is it possible to observe a star of apparent visual magnitude + 21 using a back yard telescope, Gran Telescopio Canaris or the Hubble space telescope.

Question

You record the spectrum of a distant star using a telescope on the ground on Earth. Upon analysing the spectrum, you discover absorption lines spaced at intervals typical of oxygen atoms. Which of the following are possible interpretations of this evidence? Select all that apply. The width of the spectral lines gives the diameter of the star The star is likely orbited by habitable planets with breathable atmospheres. The height of the spectral lines above the star's general blackbody spectral curve tells us how much oxygen is in the star The atmosphere of Earth contains oxygen The red or blueshift of the set of lines can tell us the speed of the star's motion toward or away from us

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Chapter 14, Problem 11RQ

To determine

Check whether is it possible to observe a star of apparent visual magnitude +21 using a back yard telescope, Gran Telescopio Canaris or the Hubble space telescope.

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