Since energy is not conserved in GR, would you agree ...

[Alan Grayson]

that Newton's First Law of Motion is violated; that is, a body put into motion in empty space, will NOT continue to move at a constant velocity forever? AG

[Alan Grayson]

On Sunday, November 16, 2025 at 4:48:06 AM UTC-7 Alan Grayson wrote:

that Newton's First Law of Motion is violated; that is, a body put into motion in empty space, will NOT continue to move at a constant velocity forever? AG

If photons lose energy as the universe expands, resulting in longer wave lengths, it's reasonable to suppose that material bodies do the same. Since the wavelength of a material body is h/p, as the wavelength increases, p must decease, eventually coming to rest, and violating Newton's First Law of Motion. AG 

[Alan Grayson]

This implies the expansion of the universe is generally slowing down, and will eventually stop. AG