April 20 , 2019
                                                                          2386 days 
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 	- Scientists have detected the most ancient type of molecule in our universe in space for the first time ever.
- Falling temperatures in the young universe allowed recombination of the light elements produced in the Big Bang.
- At that time, ionized hydrogen and neutral helium atoms reacted to form HeH+.
 
                            
                                
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