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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, ordinary matter interacts with radiation,  ...

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

Today, we do not know what is the exact cause of this force, just that it exists. 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 ... Dark matter is the name we give to matter we can not observe directly, and that ... in fact, that they should have been able to escape the gravitational pull of the ...

www.scientificamerican.com/article/what-are-dark-matter-and

Aug 28, 2006 ... Dark energy and dark matter describe proposed solutions to as yet unresolved gravitational phenomena. So far as we know, the two are distinct ...

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

May 1, 2013 ... 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?

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 ...

starchild.gsfc.nasa.gov/docs/StarChild/universe_level2/darkmatter.html

Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is ...

www.universetoday.com/119297/how-do-we-know-dark-matter-exists

How do we know dark matter actually exists, when we have no idea what it actually ..... 'To call “dark matter” and “dark energy” DISCOVERIES is a violation of a ...

www.coursehero.com/file/p5umm0af/Why-do-we-call-dark-matter-dark-It-emits-no-radiation-that-we-have-been-able-to

Mar 28, 2016 ... Why do we call dark matter dark It emits no radiation that we have been able to from ASTR 100 at University of Illinois, Urbana Champaign.

www.thegreatcourses.com/courses/dark-matter-dark-energy-the-dark-side-of-the-universe.html

Scientists call these invisible components dark matter and dark energy; "dark" because these phenomena do not emit light, not because we are not learning ...