Is dark matter absence of light?

A: Dark matter is called “dark” because it doesn’t give off or interact with light — including through scattering. It is simply the nature of dark matter and why it is so difficult to study. However, dark matter does have mass and its gravity can influence matter and light.

What if there was no dark matter?

Without dark matter, galaxies would lose a large fraction of the gas that forms new stars immediate after the first major star-forming event they experienced.

Why is dark matter so hard to detect?

Dark matter. Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter. Dark matter

Is darkness the absence of light?

I like “darkness is the absence of light.” Using that definition, then the answer has to be “no, because dark objects do not emit visible light.” The confusion comes in when you start thinking about the full range of the spectrum. Typically, we think of “light” as “visible light” alone.

Why is there no darkness in nature?

The simple answer is that all normal matter emits electromagnetic radiation through blackbody radiation. So, in a sense, there cannot be darkness. Any normal matter with any energy at all (above absolute zero by the most minute amount) emits blackbody radiation.

Can dark energy have a negative mass?

Yes: Dark energy could be (and are) negative (relativistic) mass (neutrinos). Negative relativistic mass would also have negative (reversed) gravity. Dark energy behaves exactly like negative gravity. According to both Newton and Einstein negative gravity can arise from a negative relativistic mass. What could have negative relativistic mass?