article_snippet.sent: ‘dark’ moniker and making it detection incredibly difficult.
article_snippet.sent: There is something missing.
article_snippet.sent: Dark energy is an unknown force across the whole cosmos that seems to be accelerating the expansion of our universe.
article_snippet.sent: The nature of that interaction is unknown; it could be caused by well-known effects or some unknown force.
article_snippet.sent: All that can be said at this point is that it is not gravity.
article_snippet.sent: this collision happened to take place directly in front of a much more distant, unrelated source.
article_snippet.sent: The researchers note that more investigation will be needed into other effects that could also produce a lag.