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4

it's an interesting question. It could ask about any violent transient effect that produces light and gravitational waves, though "popping out of existence" is the ultimate step function. electromagnetic (EM) radiation is slowed very slightly by the presence of interstellar medium (especially by free electrons) and it's wavelength dependent. The image ...


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In fact, something like such a mirror do exist in the universe. Dust arround progenitor of SN 1572 still reflects light od the outburst. Spectral analysis of the light confirm that the supernova was of Ia type (the fact established long before from light curve of the supernova). Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its ...


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