The element strontium (chemical symbol, Sr) has an atomic number of 38 and four forms known as isotopes, ⁸⁴Sr, ⁸⁶Sr, ⁸⁷Sr and ⁸⁸Sr. Although these isotopes are stable, their ...

Watson and his colleagues have now identified the signature of the heavy element strontium within the fireball. On Earth, strontium is found naturally in soil and is concentrated in certain minerals.

For the first time, astronomers have definitively ID’d a specific heavy element forged by a neutron ... Watson of the University of Copenhagen. Strontium, on the other hand, is relatively ...