Which is the color of dark matter?

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hnystrom's profile pic

hnystrom | High School Teacher | (Level 1) Assistant Educator

Posted on

The perception of color is based upon what photons of light are received by the eye.  There are two types of dark matter: cold material that gives off little radiation of its own; and new types of matter whose properties have not yet been determined.  The Earth is an example of the first type of dark matter,  It gives off some radiation in the form of heat but the rest is reflected light from the Sun.  If the nearest star had Earth-like planets they would be invisible to us, or "dark".  There may be dead planets and stars in space that would also be "dark"

The other matter would also be invisible to our eyes because it would not give off light.  Light reacts strongly with the matter we know today so if it reacts with light we should have seen some visible evidence of it by now.  How do we know it is out there?  We have studied the motions of stars in our galaxy.  From the motion studies we can estimate how much mass is holding those stars in the galaxy.  We find that from the motion there is more mass than can be seeing emitting light.  We see further examples in other galaxies of more matter than can be seen.  This new form of matter must not interact strongly with matter except for gravity.  This suggests that there must be alot of it out there because gravity is essentially a weak force unless there is a lot of matter around,

besure77's profile pic

besure77 | Middle School Teacher | (Level 1) Senior Educator

Posted on

Dark matter does not have a color, it is actually transparent. Fritz Zwicky originally came up with the term "dark matter" in the 1930's. He discovered evidence for missing mass in galaxies. This mass is detected through a gravitational force on visible matter.

Scientists are still uncertain about what dark matter really is and how it works. There is a great deal of research being conducted and it is still very mysterious. There really is not anyone who can say exactly what it is, how much of it there is, and what impact it has on the universe.

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

Dark matter has no color, because it's transparent, so it is invisible.

Let's see what makes a body to be black or dark in color. If the body is dark, it means that the body absorbs almost all photons of light which are falling on that body. Because these photons are not reflected back to reach the eye of the beholder, that area of space where that body is, is appearing to have no color. It means that appears black in that area in the image formed in our brains. But because other bodies around it, reflect some light and those bodies could be seen, our brains deduce that there exists a body and it is black. But if it is completely dark, then any colored bodies could not be seen and everything is black.

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