For a more critical look at this concept, I recommend "Mission to the Gravitational Focus of the Sun: A Critical Analysis". https://arxiv.org/abs/1604.06351 ht

For a more critical look at this concept, I recommend "Mission to the Gravitational Focus of the Sun: A Critical Analysis". https://arxiv.org/abs/1604.06351 https://arxiv.org/abs/1604.06351