... that are present in the Solar System today. *(isotopes are atoms of an element with the normal number of protons and electrons, but different numbers of neutrons)
... when stars with an initial mass of eight solar masses or more undergo core collapse. During this process protons and neutrons essentially melt into each other to form neutrons and the energy involved in such a process...
..., which are classed as leptons. Baryonic matter on the other hand is made up of particles found in an atomic nuclei, such as protons and neutrons. WIMPS stands for Weakly Interacting Massive Particles and these hypothetical particles are thought...
..., but then some of it decayed. "Let us imagine that dark matter consists of several components, as in ordinary matter (protons, electrons, neutrons, neutrinos, photons). And one component consists of unstable particles with a rather long lifespan...
... sky. It is the oldest light in the universe, dating back to the epoch of recombination when charged electrons and protons first came together to form electrically neutral hydrogen atoms. This relic radiation has been extensively studied...
... (BAO), which are regular, periodic fluctuations in the density of the visible baryonic matter (normal matter such as protons and electrons) of the Universe. These oscillations are analogous to sound waves created in air by pressure differences and...