Question

problem 34 we observe a glowing cloud of gas in space with a spectroscope. we note that many of the familiar lines of hydrogen that we know on earth seem to be in a different place. they are shifted toward the blue or violet end of the spectrum compared to their positions in the spectrum of glowing hydrogen gas on earth. from this we can conclude that the cloud is moving toward us. the cloud is much hotter than hydrogen on earth. the cloud is moving away from us. the cloud is much cooler than hydrogen on earth. none of these can be concluded from this observation. submit hint feedback i give up! 4 submission(s) remaining hints: 0% deduction per hint. hints remaining: 1 feedback: 0% deduction per feedback. grade summary deductions 0% potential 100% submissions attempt(s) remaining: 4 25% deduction per attempt detailed view

Explanation:

This is related to the Doppler - effect in astronomy. When spectral lines of a celestial object shift towards the blue or violet end (blue - shift), it indicates that the object is moving towards the observer.

Answer:

the cloud is moving toward us.