I would love to hear someone talk about this actually as it has been my pet theory for the last 15 years since high school physics. My reasoning was p = mv. m

I would love to hear someone talk about this actually as it has been my pet theory for the last 15 years since high school physics. My reasoning was p = mv. m drops (through various processes in a star emitting energi==mass) and since p is constant, v increases. Probably totally naive, but it is just a thought which has stuck around with me.