When scientists discovered an enormous black hole thousands of light-years from where it ought to be in space, they knew they ...
Some things we see in space appear to outpace light. Now we are learning to harness these bizarre optical illusions to ...
The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...
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