I suppose that you think to physicists.
A physicist
Energy
Most scientists think that, as the foundations of emotions, thoughts ignite as a result of energy, and energy is matter.
physicist(:
you think we wont tell u!!!!
how dose scientists define matter?
Humans need energy for different purposes. Electricity is simply a convenient way to transport energy.
atoms or molecules
Scientists call this law the law of conservation of matter
Matter cannot be created or destroyed. It can only be changed from one form to another. However, Einstein and other scientists have shown us that matter and energy are interchangeable. Matter is changed into energy in the sun and in other nuclear reactions, (E = mc2).
A good example of visible energy is found in the stars. An example of invisible matter is the "dark matter" that scientists believe surrounds galaxies. So, one answer to the question would be "in and around galaxies".
I think the question is a bit mixed up, but I think this is the answer. Scientists talk about "mass-energy" as a unified thing. Just after the Big Bang "energy", in the form of radiation energy, was dominant. However, today it seems that "mass" is the dominant form. In other words, "matter" now dominates the Universe. There is the complication of "Dark Matter" and "Dark Energy". Cosmologists still don't really know what these are. So that puts some uncertainty into this discussion of matter and energy. Some scientists believe that it is now "energy" that dominates, because of the discovery of Dark Energy. (Also, cosmologists think that both "matter" and "anti-matter" were created, but that there was a slight imbalance in favour of matter and the anti-matter seems to have been destroyed, leaving just "matter".)