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3 votes
1 answer
107 views

Gravitational wavelength shift of microwave background radiation

I can't find this precise question answered. It is basically a two part question. Would the microwave background radiation, as well as light travelling to us from stars in an expanding universe ...
Joseph Hirsch's user avatar
3 votes
2 answers
436 views

Do electromagnetic fields gravitate?

It's well known that electromagnetic fields contains energy but do they gravitate? When we talk about the composition of the universe it's now accepted that the 74% is dark energy, the 22% is dark ...
Andrea Scaglioni's user avatar