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en.wikipedia.org/wiki/Dark_matter

Dark matter is a hypothetical type of matter distinct from baryonic matter neutrinos and dark ..... Although both dark matter and ordinary matter are "matter", they do not behave in the same way. In particular, in the early universe, ordinary matter ...

www.nationalgeographic.com/science/space/dark-matter

Photo: A simulation of the dark matter distribution in the universe 13.6 billion years ago ... or less the same speed regardless of where they are in the galactic disk. ... For lack of a better name, scientists call this mysterious force dark energy.

www.e-education.psu.edu/astro801/content/l10_p9.html

Just like the rotation curves of Galaxies, you can also study the velocities of ... Since we call the matter that we cannot observe directly "dark matter," we call this  ...

www.cfhtlens.org/public/what-dark-matter

Scientists call this 'regular' matter baryonic matter, so called because it is made up of particles called baryons. Dark matter is the name we give to matter we can ...

www.space.com/20930-dark-matter.html

Jun 15, 2017 ... Dark matter emits no light, and cannot be directly observed, but scientists think ... If scientists can't see dark matter, how do they know it exists?

www.quantumdiaries.org/2013/06/26/does-dark-matter-really-exist

Jun 26, 2013 ... Some of you may have heard of dark matter, this mysterious type of matter that no one can see but makes 27% of the content of the Universe ...

starchild.gsfc.nasa.gov/docs/StarChild/questions/question59.html

Dark matter is the name scientists have given to the particles which we believe exist in the universe, but which we cannot directly see! Dark matter was initially ...

cass.ucsd.edu/archive/public/tutorial/DM.html

This means that the mass is still increasing as we move outward, even though we can't see anything! One again we have to call upon "dark matter". The galaxy ...

courses.lumenlearning.com/suny-astronomy/chapter/the-challenge-of-dark-matter

There is much more dark matter, in fact, than matter we can see—which means it .... Here, the two small galaxies we call the Large Magellanic Cloud and Small ...