Before Star Trek: Discovery was around, back in 2009, J.J. Abrams set up several mysteries during the first Kelvin Timeline movie. The imaginatively named Star Trek. The most significant one of these for the 'Prime' Star Trek timeline was the Romulan Supernova. But is Star Trek: Discovery Season 5 explain the Romulan Supernova?
Star Trek Online already explained it:
Indeed, the article devotes three paragraphs to that explanation.