/u/Fl4mmer's posts in /r/askscience

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Redshift, to my understanding, means the wavelength of light gets longer as it travels through space. Photons with a short wavelengths have higher energies than those with longer ones. Where does the energy lost through redshift go? Is there even energy lost or is it something entirely different?

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How do blood types in pregnancy work? Why don't different blood types kill the child, if circulation is intertwined?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Redshift, to my understanding, means the wavelength of light gets longer as it travels through space. Photons with a short wavelengths have higher energies than those with longer ones. Where does the energy lost through redshift go? Is there even energy lost or is it something entirely different?	1
How do blood types in pregnancy work? Why don't different blood types kill the child, if circulation is intertwined?	1