That's because as the Earth moves around the Sun, it is moving into a stationary field of dark matter - and for half the year it will be moving against the tide of dark matter - just like driving into the rain.

BBC: Dark Matter: Experiment to shed light on dark particles

There are stationary structures that players can place on the field.

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So the task that Dr Eden and Dr Zeffiro devised was to look at a field of small spots on a computer screen, four-fifths of them stationary and the rest drifting slowly to the left or the right.

ECONOMIST: Reading minds | The