We call these " optical double stars" .

我们称之为为“光学双星”。

They were like those double stars which revolve around each other, and from a distance appear to be one.

他们像是那种双星，你绕着我转，我绕着你转，老远看上去是一颗星。

Star clusters, supernova remnants, and a double star all make it worth it to take a closer look at Cassiopeia.

星团、超新星遗迹，还有双星，它们都值得你仔细地观察仙后座。

Today you learned double stars are stars that appear to be near each other in the sky, but if they're gravitationally bound together we call them binary stars.

今天你学到了双星是指在天空中看起来彼此靠近的恒星，但如果它们在引力作用下结合在一起，我们就称它们为物理双星。

'Saturn is lovely; Jupiter is simply sublime; I can see double stars in the Lion and in the Virgin, where I had seen only a single one before.

“土星很可爱; 木星简直是崇高的; 我可以在狮子和圣母身上看到双星， 我以前只见过一颗。

Then they proceeded to scan the sky, roving from planet to star, from single stars to double stars, from double to coloured stars, in the cursory manner of the merely curious.

然后他们开始扫视天空，从一个行星到另一个恒星，从单星到双星，从双星到彩色恒星，以好奇的方式粗略地巡视。