What is antimatter?

A) It consists of particles that are just like those of ordinary matter except with opposite properties, such as opposite charge.
B) It is matter that we infer to be in space by its gravitational influence, but that we have not yet identified.
C) It is a form of matter that has been hypothesized to exist but for which there is not yet any experimental evidence.
D) It is the material that makes up a complete antiuniverse that is identical to our own except that it is made from antimatter instead of matter.


A) It consists of particles that are just like those of ordinary matter except with opposite properties, such as opposite charge.

Physics & Space Science

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Ancient philosophers and astronomers accepted without question-as first principles-that:

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A thin metal sheet in the xy plane carries current in the ?y direction. What is the direction of the magnetic field everywhere in the region above the sheet? in this case

A. points in the +x direction. B. points in the ?x direction. C. points in the +y direction. D. points in the ?y direction. E. points in the +z direction. F. points in the ?z direction. T. is zero.

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What does the equivalent of an H-R diagram for galaxies, plotting luminosity versus color, show?

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