Its neutrinos reached Earth about three hours ahead of the visible light.

这些中微子比光提前三小时抵达地球。

This pulse can be detected in visible light, radio waves, and even X-rays!

这种脉冲以在光、无线电波、甚至X射线中被探测到！

Some are so cool they don't emit visible light at all, so they'd be black.

它们有些十分凉，根本发不光，所以它们是黑色的。

That energy is emitted as photons of visible light.

能量以光的光子形式发射。

This is what we call “visible light, ” also known as the visible spectrum.

这就是我们所说的“光”，又叫光谱。

Together, all the colors make up the spectrum of visible light—the light we can see.

所有的颜色一起构成了光的光谱——我们所能看到的光。

The wavelengths we see through our eyes, we call visible light.

我们通过眼睛看到的波长，我们称之光。

The exoplanet Fomalhaut b was the first one photographed with visible light.

这“北落师门b”的系外行星是第一用视光拍到的行星。

Together with visible light, all these types of radiation are called the electromagnetic spectrum.

同光一起，所有类型的辐射都叫做电磁频谱。

Just like visible light, x-rays are less likely to penetrate denser materials.

类似于光，X线难以穿过密度高的物体。

There, they absorb infrared radiation and convert it to visible green light.

在那里，它们吸收红外辐射，并将其转化的绿光。

Infrared has a longer wavelength than visible light.

红外线的波长比光更长。

And finally, we arrive back thirteen billion years ago, at the beginning of visible light.

最后，我们抵达 130 亿年前抵达光的起源。

A typical optical telescope has a diameter a few million times the wavelength of visible light.

传统的光学望远镜的直径是光波长的数百万倍。

Furthermore, it lies behind a shroud of dust that blocks any visible light from passing through.

此外在它前面还有一层阻隔任何光线通过的尘埃。

Visible light just passes over them.

光只会穿过它们。

The whole kaboodle lets visible light pass untrammelled, while absorbing infrared and converting it into heat.

整结构能够让光自由通过，同时吸收红外线并将其转化热。

Same goes for fresh asphalt, which reflects about 4% of the visible light hits it.

同理，刚铺好的沥青大约以反射百分之四的光。

It's actually infrared light, and the only difference between infrared and visible light is the wavelength.

实际上这是一种红外线，对于光和红外线来说唯一的区别就是波长。

On the left-hand side shows you what we see with visible light with the Hubble Space Telescope.

左边的图像是我们用哈勃望远镜看到的光。