Question

What do you mean by dark matter?


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Answer 1

Answer:

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 material that cannot be seen directly.We know that dark matter exist because of the effect it has on objects that we can observe directly.

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Answer 2

Answer:

Dark matter is as follows

Explanation:

Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density. Its presence is implied in a variety of astrophysical observations, including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen. For this reason, most experts think that dark matter is abundant in the universe and that it has had a strong influence on its structure and evolution. Dark matter is called dark because it does not appear to interact with observable electromagnetic radiation, such as light, and so it is undetectable by existing astronomical instruments.[1]

IN SIMPLE TERMS

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 material that cannot be seen directly. We know that dark matter exists because of the effect it has on objects that we can observe directly.