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The radius of the observable universe is about 15 billion light years.

That's 90 billion trillion miles or 1.35e+ 26 meters or 5.3149606299e+27 inches or 4.492133858e+26 feet or 4.4763779528e+26 yards or 1.25 e +28 centameters or 1.25 e + 29 mm. or 1.35 e + 32 micro meters or 1.35 e+35 nano meters or 1.35 e+38 picto meters or 1.3472083149 e+ 39 x unit or 1.35 e+ 50 yoctometer or 1.25 e+ 47 zepto meters.

Comments: That's not the usual answer, given by astronomers. They usually say "about 45 billion light years".

The AGE of the Universe is about 15 billion years, or more precisely about 13.7 billion years. So, light reaching us cannot have travelled more than about 13.7 billion light years.

However, the Universe has been expanding. Something that emitted light 13.7 billion years ago could NOW be as far away as about 45 billion light years.

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