Getting to the Gravitational Lens in 8.5 to 15 Years
• https://www.nextbigfuture.com, by Brian WangExtreme metamaterial ceramic solar sails survive a close pass of our sun to reach speeds of 60-70AU per year which is over 0.1% of light speed. Theis propel low mass spacecraft using a dive to extreme proximity to the sun (just 2-5 solar radii).