The name "dark matter" is correct?

Expert Answers
besure77 eNotes educator| Certified Educator

Dark matter is thought to make up 90 percent of the universe. It cannot absorb light and it cannot give off light so it considered to be invisible. It is thought to exist because of gravitational purposes. Nobody really knows for sure what dark matter is and generally speaking there are many theories regarding what it is but it is a mystery all the same.

With this in mind, I think this may be the reason that it is called dark matter. It is mysterious and although many theories are present regarding exactly what it is, no one really knows for certain what it is. And to top it all off, it is invisible.

giorgiana1976 | Student

First of all, what makes a body to be black or dark in color? 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.

Instead, if photons of light are sent toward the dark matter, photons of light are passing through the dark matter, non-interacting with it, at all. Therefore, we can see what it is behind dark matter.

Dark matter is therefore transparent and thus, invisible.

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