These are the devastating effects of a Falcon Punch Collision (FPC). Such a collision would be several orders of magnitude more powerful than a gamma ray burst and initiate a paradox. FPCs are often considered what would be one of the most devastating doomsday disasters ever.
The score to this footage is "Title BGM" from the F-ZERO-X OST arrangement. I would also like to give credit to the people who originally thought of this concept on SSB64.
If ads play before the video, my apologies. It was not my decision. Thank Lionsgate (and get yourself some adblock!).