７０−５　A Plan to Build Interstellar Spacecraft

○2016　 The Team of Stephen Hawking and Yuri Milner proposed making a journey to Alpha Centauri.
○The craft will have a solar sail, a few meters across and weighing a few grams.
○And the craft will reach 20% of the speed of light—fast enough to reach Alpha Centauri(distance: about 4 light years) in 20 years.
○The team calculates the laser technology will be ready in a few decades’ time. （Energy source is nuclear fusion.（⇒No.７２））

【Reference】
Science News
http://www.sciencemag.org/news/2016/04/russian-billionaire-unveils-big-plan-build-tiny-interstellar-spacecraft