Gravitational waves can't actually be seen as in this simulation. When gazing at the night sky from here on Earth, it’s easy to picture the Universe as calm and unhurried. But in reality, out there in space, things move fast – really fast. Putting aside particle accelerators and the like, the fastest-moving man-made object was the Helios 2 spacecraft launched in the 1970s. It reached a top speed of 68.75 km/s (153,800 mph) on its mission to the Sun. But this was just a leisurely stroll compared to the fastest things in the Cosmos. So, where do we find the real speed freaks of the Universe? Here’s a run-down of the top five. 1. Expansion of the Universe Speed: Greater than the speed of light! The Universe is expanding. But the Universe isn’t filling up ‘empty space’ as it expands because it is ‘space’ itself which is expanding. Although the laws of physics say that two objects can’t move faster than light speed with respect to each other, there is no such restricti...
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