So in many ways the world has become a much less lonely place in the four decades since the first lonely Planet guidebook.

所以，在很多方面，这个世界自从第一本LP指导手册面世以来到现在40年来变的更加不孤独。

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One of the four brightest satellites of Jupiter and the ninth in distance from the planet. It was first sighted by Galileo.

木卫一：木星四颗最明亮的卫星之一，距木星的距离排为第九。它首先为伽利略所发现。

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That means there are two pairs of planets, and each time the first member of the pair makes three orbits another planet completes four.

这意味着有两组双行星，而且每组的第一个成员公转3圈的同时另一个星球公转4圈。

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Its biggest instrument alone is nearly four times the mass of the very first robot rover deployed on the planet back in 1997.

BBC: Nasa's Curiosity rover successfully lands on Mars