Here is a question that has been bugging me for a while… When a star is moving through space it has momentum equal to its mass times its velocity. As the star converts hydrogen into helium it loses mass as that mass is converted to energy (light) and neutrinos. Both of these escape the star in all directions. The loss of this mass should not impact the momentum of the star since any mass/energy radiated in one direction is countered by the same mass/energy radiated on the opposite direction. So the net result is a loss of mass with momentum conserved. In classical Newtonian physics, momentum must be conserved so, to balance the (momentum = mass x velocity) equation, one would require the star to increase its velocity. If you include the mass lost by coronal mass ejections which also occur in all directions... the loss of mass is even more pronounced... (momentum = mass x velocity) vs (momentum = slightly less mass x slightly more velocity) Now the acceleration of stars over time has in fact been observed. Reference the type 1a supernova study done. But the increase in velocity was attributed to “dark energy” isn’t this classical Newtonian explanation a far better way of explaining the increase in velocity observed rather than relying on “dark energy”?