How Was the Universe Made

We believe that radiation dominated matter in the early universe. While photons still outnumber hydrogen atoms by about a billion to one in the universe, matter now contains far more energy than radiation. A simple calculation, using Einstein's celebrated equation showing the equivalence of energy and mass, E = mc2, shows that matter, not radiation, is dominant in the current universe. The energy contained in all the mass in the universe is greater than the energy contained in all the radiation.

As the universe expands, both radiation and matter become less concentrated; they travel with the expansion. The energy of the radiation is diminished more rapidly than the density of matter, however, because the photons are redshifted, becoming less energetic as their wavelength lengthens. Thus, over time, matter has come to dominate the universe.

At the moment of the Big Bang, the entire universe came into being. The elements hydrogen (73 percent) and helium (27 percent ) were created in the primordial fireball, along with small amounts of lithium.

Astro Byte

At the moment of the Big Bang, the entire universe came into being. The elements hydrogen (73 percent) and helium (27 percent ) were created in the primordial fireball, along with small amounts of lithium.

Telescopes Mastery

Telescopes Mastery

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