Is there an element that does not decay but can be identified from a

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The discussion centers on the identification of elements that do not decay and can be detected from great distances. It highlights that spectroscopic methods allow for the analysis of an element's composition as long as the source is sufficiently bright, enabling researchers to identify the same elements across the universe. Additionally, it is noted that many elements in the periodic table possess at least one stable isotope that does not undergo decay, which contributes to their detectability. The conversation suggests that while uranium-238 has a long half-life, there are other stable isotopes that may be more relevant for distant identification.
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Is there an element that does not decay but can be identified from a extremely far distance or an element with a multi-billion year half life
 
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uranium-238
 


my theory is way too risky
 


Spectroscopic methods are not distance related - assuming source is bright enough we can research its composition from any distance. That's how we know there are the same elements in other parts of the Universe.
 


Not really sure what you are after here ... most of the elements in the periodic table have at least one stable isotope that does not decay.
 

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