72 Space Travel【Space Travel】Dialogue with the Universe

72 Space Travel【Space Travel】Dialogue with the Universe

At a rate of traditional sailing ship it takes
・15 to 20 years to out of Solar System
・250 years to go to the nearest star 4 light years away.
Note: García-Sánchez, J. et al. (2001). “Stellar encounters with the solar system”. Astronomy and Astrophysics 379: 634-659.
http://ja.wikipedia.org/wiki/%E8%BF%91%E3%81%84%E6%81%92%E6%98%9F%E3%81%AE%E4%B8%80%E8%A6%A7

・It takes about 1,000 years for 20 light years by the ship cruising speed of the current