Astronomy 2022A/B Lecture Notes - Lecture 2: Einstein Tensor, Vesto Slipher, Edwin Hubble

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The everyday meaning of theory is 3, whereas the scientific meaning ranges between 1 and 2. Some scientific theories are indeed still undergoing testing but one shouldn"t" dismiss a scientific explanation because its just a theory : to a scientist, theory means explanation . The universe is a vast space that seems to have existed for a long time: the universe also includes the contents of this space. Everything ever observed in the universe is made either of matter or energy. Einstein"s most famous equation, e= mc^2 matter: so initially we can say the universe is a vast space-time can turn into energy, and vice-versa filled with matter energy. The universe is composed entirely of matter-energy: matter refers to material objects, solids, liquids and gases, energy includes light, heat, sound, motion and others which are composed of atoms. Albert einstein"s theories of relativity: special relativity in 1905, general relativity in 1916. Time and space do not stand apart.

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