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>In 2002 Daniel Holz and John Wheeler investigated this idea and ran all the calculations in their paper Retro-MACHOs: Pi in the Sky? That's one of the best pa
by Intermernet 12y ago
>In 2002 Daniel Holz and John Wheeler investigated this idea and ran all the calculations in their paper Retro-MACHOs: Pi in the Sky?
That's one of the best paper names I've come across.
From the introduction:
>The bending power of a black hole is not limited,
however, to small angles but reaches π and odd multiples
of π. Illuminated by a powerful point source of light,
the black hole will therefore shine back with a series of concentric rings (we call this retrolensing).
Does anyone know if this sort of research is on the agenda for the James Webb Space Telescope? Our space imaging has progressed dramatically in the last couple of decades, so it wouldn't surprise me to see many more MACHOs (maybe even Retro-MACHOs!) being discovered, in the same way our understanding of the vast number of galaxies in the universe was increased by the Hubble Space Telescope.