@dgar Indeed, I've decided to nerd out a bit here...

Assuming "red" is 420 THz and "blue" is 650 THz, with the receiver standing still while *in the vacuum of space*.

The rose will be travelling to the viewer at... 106,080,408 m/s
or...
at 35.38% the speed of light!!!

Now that's a fast rose headed RIGHT at you xD