Janhunen says it would take a 440-pound (200-kilogram) spacecraft using an electric sail less than five years to travel between Earth and dwarf planet Pluto.
Janhunen说，采用该电驱动帆作为动力，440磅(200千克)重的航天器从地球飞到冥王星所需时间少于5年。
1930 - The planet Pluto is officially named.
1930年的今天，冥王星被正式命名。
1978 - Charon, a satellite of the planet Pluto, is discovered.
1978年的今天，冥王星的冥卫一卫星被发现。
The planet Pluto and the moon Triton have almost the same size and density.
冥王星与海卫一几乎同样大小，同样密度。
In 1930 astronomer Clyde Tombaugh discovered the dwarf planet Pluto while looking at photographs of the night sky.
1930年，天文学家克莱德·汤博在研究夜空照片的时候发现了矮行星冥王星。
In 1930, astronomer Clyde Tombaugh discovered the dwarf planet Pluto while looking at photographs of the night sky.
1930年天文学家克莱德·汤博就是研究了夜空的图片后发现了矮行星冥王星。
In 1930, astronomer Clyde Tombaugh discovered the dwarf planet Pluto while looking at photographs of the night sky.
1930年天文学家克莱德·汤博就是研究了夜空的图片后发现了矮行星冥王星。
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