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This question already has an answer here:

It seems very certain that dark matter exists and that it makes up 26.8% of the Universe today (along with 68.3% Dark Energy and 4.9% Atoms), but how can this be if we cannot see it or directly detect it?

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marked as duplicate by Kyle Kanos, Rob Jeffries, ACuriousMind, Brandon Enright, Martin Dec 14 '14 at 23:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Have you read Wikipedia ? There is a long section on the observational evidence. $\endgroup$ – Ross Millikan Dec 14 '14 at 21:26
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    $\begingroup$ possible duplicate of Is there evidence of dark matter in our galaxy? $\endgroup$ – Kyle Kanos Dec 14 '14 at 21:29
  • $\begingroup$ I feel like this should be a duplicate of something, but not the linked question. In fact, almost none of the evidence we have for dark matter comes from our own galaxy. $\endgroup$ – user10851 Dec 14 '14 at 22:40
  • $\begingroup$ This question appears to be off-topic because it shows insufficient prior research (see the Wikipedia article). If the information of that article is included, it is too broad, because there is a lot of observational evidence. $\endgroup$ – Martin Dec 14 '14 at 23:10
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according to the astrophysical observations which shows for example: much more bending expected in lights directions due to the gravity of the stars and galaxies we know. it means we know there are four example 2 galaxies which can bend the light which come from a third and farther galaxy. and the bending to the light due to these 2 galaxies should be X. but the observed bending is much more than X. so there should be something else which cause it to bend more. It is one of the evidences... you can read more in Wiki or others.

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