From Robert Lawrance
With the article on the position of stars in the night sky you printed a diagram showing possible negative refraction around the ergosphere of a black hole, the zone surrounding it from which energy and matter can escape (4 June, p 30). This showed Earth’s plane of orbit in the same plane as the ergosphere.
Would it be possible to check for negative refraction by measuring the location of a star at the two extremes of the Earth’s orbit? Surely negative refraction would shift the location.
Mount Gambier, South Australia
