OK, so what's the speed of dark?

好吧，那么黑暗的速度呢？

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That's because they use a model of dark matter that decays into certain types of particles such as heavy quarks and travels at the same speed no matter what the temperature is.

由于他们采用的暗物质模型只能衰退为诸如重夸克这样的特定粒子，并且运行速度平稳，未受温度影响。

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Astronomers who study star clusters have noticed that the speed at which a star of a given mass spins (measured by tracking cool, dark spots on the surface) also seems to vary predictably with age.

研究星团的天文学家已经注意到质量一定的行星(通过追踪表面阴暗冷却斑点来测量)，其旋转速度随着其星龄呈现可预测性的变化。

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What is believed to be causing this increase in the speed of expansion is called dark energy, making up more than 70% of the mass-energy - all of the "stuff" - of the Universe and the focus of the DECam's mission.

BBC: Dark energy camera snaps first images ahead of survey

Great even in low light, the camera's 12.1-megapixel High-Sensitivity CMOS image sensor and DIGIC 5 image processor combine and deliver on Canon's HS SYSTEM helping ensure detail is captured even in dark or shadowed areas at a maximum ISO speed of up to 6400.

ENGADGET: Canon PowerShot A2500, ELPH 330 HS, 115 IS point-and-shoots debut ahead of CP+

One dark side of the Internet is the ability to spread lies at the speed of light.

CNN: BELIEVE IT OR NET