Credit: NASA/JPL-Caltech
(1) The chaotic evolution of the planetary orbits in the Solar System could cause a close approach or even a collision within the next 5 billion years. 太陽系行星軌道的緩慢演化可能導致未來50億年內出現混亂局面． http://www.nature.com/nature/jou ... ll/nature08096.html
Credit: W. Carlos and J.M.P.
(2) Observations of the Sun during total eclipses have led to major discoveries. Solar eclipses are astrophysical laboratory for astronomers. 日全蝕仍然是天文學家的天文物理實驗室． http://www.nature.com/nature/jou ... ll/nature07987.html
發表於 2009-6-13 10:47:00