这是1990 年6月6日旅行者1号在四十亿公里外拍摄到的地球图片。地球就是在最右边那条光线中暗淡的蓝点。美国天文学家卡尔·萨根（Carl Sagan）对此这样描述：

That’s here.
That’s home.
That’s us.
On it everyone you love,
everyone you know,
everyone you ever heard of,
every human being who ever was, lived out their lives.
The aggregate of our joy and suffering,
thousands of confident religions, ideologies, and economic doctrines,
every hunter and forager,
every hero and coward,
every creator and destroyer of civilization,
every king and peasant,
every young couple in love,
every mother and father, hopeful child, inventor and explorer,
every teacher of morals,
every corrupt politician,
every “superstar”,
every “supreme leader”,
every saint and sinner in the history of our species lived there
— on a mote of dust suspended in a sunbeam.

这张照片提供了一个前所未有的角度来看地球。在寂寥无边的宇宙中，我们生活的这个星球仅仅是阳光里的一粒尘埃。