It has been estimated that all matter and energy originated from a single location in the Big Bang about 20 billion years ago. The universe may keep expanding or the expansion may give way to arrest or even contraction. Current indications from measured recessional velocities of very distant ...
is slowly converging into many galaxies under the action of gravitation. In the case of gravitational attraction, the galactic space expands outward, and the more the galaxy expands, the weaker the gravitational pull of each other, the expansion of the galaxy's space will slowly accelerate. The...
Expansion of the UniverseOur story starts 13.7 billion years ago (bya) with a very important observation: that the Universe is expanding. This is the foundation of our understanding of the past. It is the single most important fact in this story. So how do we know that it is expanding?
4. Multiple Choice 30 sec 1 pt What process is responsible for the formation of the basic elements? Biogenesis Nucleosynthesis Singularity Abiogenesis 5. Multiple Choice 30 sec 1 pt Which of the following theory describes the period of exponential expansion of the universe prior to the m...
The gist of the argument is that by extrapolation backwards from the observed expansion of the universe (which is assumed to be linear) a zero point is reached at which the universe, and therefore its material contents, had but infinitesimal dimensions; by extrapolation backwards from the known ...
The early universe was a chaotic, randomly-fluctuating place. But eventually some tiny patch of space came to be dominated by the potential energy of some scalar field. That led to a period of accelerated expansion that smoothed out any perturbations, eventually reheating into the observed Big ...
temperatureforthecurrentuniverseofabout3 degreesKelvin.ThissupportstheBigBang theory. Whatisthecosmologicalredshift? Photonsfromdistantgalaxiesareallredshifted. Thisisacolorshiftintheradiationspectrumof galaxies.Thefurtherawaythegalaxythegreaterits redshift.Thisredshiftiscausedbytheexpansionof ...
It then is a mystery how they could have shared the same physical laws. This problem was solved by the introduction of the idea of inflation, a phase of extremely rapid expansion of the Universe during the first fraction of a second following the Big Bang. The author explains how the ...
the cosmic explosion (or expansion) of a subatomic ball that moved space, time, matter and energy away in all directions. Everything came from an initial speck of infinite density (also known as a "singularity"). This speck for some reason exploded (started expanding). Before that explosion...
After the formation of galaxies, and finally, our solar system, about 4.5 billion years ago, for the next several billion years the expansion of the Universe gradually slowed down as the matter in the Universe pulled on itself by gravity. One can ask whether the present expansion will continue...