However , that latter finding has been actively debated in the literature .
Also , in 2008 , ESO astronomers estimated with a precision within 1 % the distance to the Cepheid RS Puppis , using light echos from a nebula in which it is embedded .
That latter finding has been actively debated in the literature .
Also , in 2008 , ESO astronomers estimated with a precision within 1 % the distance to the Cepheid RS Puppis , using light echos from a nebula in which it is embedded .