The oldest observable light in the universe is in the same wavelength range that cooks your food — microwaves! The cosmic microwave background was emitted about 13.8 billion years ago, when the universe was just 380,000 years old. https://tmblr.co/Zz_Uqj2bmSLWy #MicrowaveOvenDay #NASAUniverse
If you look at your baby photos, you might see hints of the person you are today — a certain look in the eyes, maybe the hint of your future nose or ears. In the same way, scientists examine the...
