In that case, given that a rose would need to have a certain minimum angular size to be recognisably a rose, and it would have to be outside the atmosphere to not be a guarantee of the imminent cessation of my existence, that would have to be a VERY big rose, which doesn't bode well for life on earth if it's approaching at relativistic speeds. Or are you suggesting that it's a galactic - scale rose, and we've got a few million years before it obliterates the Milky Way?