That means that its light will undergo a Doppler shift, and that can be detected.

这意味着它的光会经历多普勒频移，并且可以被探测到。

If we know the planets' mass from the star's Doppler shift, we can use the planet's size to calculate its density.

如果过恒星的多普勒频移知道行星的质量，就可以用行星的大小来计算它的密度。

Another way is to measure the Doppler shift in a star's light due to reflexive motion as the planet orbits.

另一种方法是测量恒星光的多普勒频移，这种频移是由行星绕轨道运行时的自反运动引起的。

The stars Slipher looked at showed unmistakable signs of a Doppler shift.

斯莱弗所观察的恒星显示出明显的多普勒频移。

The stars Slipher looked at showed unmistakable signs of a Doppler shift, the same mechanism behind that distinctive stretched-out yee-yummm sound cars make as they flash past on a racetrack.

斯莱弗发现，这些恒星明确显示出一种多普勒频移的，跟赛车场上飞驰而过的汽车发出的那种连贯而又特有的“嚓——嗖”的声音属于同一机制。

While we may not see that motion directly, if we take spectra of their light, breaking it up into individual narrow colors, we can see the Doppler shift in their spectra.

虽然可能无法直接看到这种运动，但如果把它的光谱分解成单独的窄色，可以看到在它光谱中的多普勒频移。

Frequency shifting means that we adjust the frequency, and keying means that a 1 is assigned to one frequency, and a 0 to another, just like our traffic light colors.

频移意味着调整频率，键控意味着 1 分配给一个频率，0 分配给另一个频率， 就像的交灯颜色一样。

Star forming gas clouds emit a very narrow wavelength range of radio waves, and this could be used to measure their Doppler shift, how quickly they were moving toward or away from us.

恒星形成气体云发射出波长范围非常窄的无电波，这可以用来测量它的多普勒频移，即它向移动或远离的速度。