The Big Bang Theory : El Big Bang
The Big Bang Theory is the most accepted and dominant theory. The big bang was an expansion of space, not matter. It is estimated that the big bang happened around 13.7 billion years. The big bang started as a very hot , dense position then cooled as it grew. A portion of this came from the of the research of the cosmic microwave background, the afterglow and radiation from the big bang. This helps the scientists go into further detail about the big bang. Chemical elements formed, temperatures cooled, and protons and neutrons collided to make an isotope for hydrogen. Although about the first 400,000 years it was crucial for light to shine through because of the hot temperatures, atoms crashed with each other with enough force to break up and light was able to scatter like fog. The Hubble Telescope also helps scientists help uncover the answers to the beginning of time.
The Doppler effect or Doppler shift, detects the shift in motion to or away from by sound. The Doppler shift can as well occur in light as in sound. When a star is coming towards Earth, its wavelengths of light are compressed, causing a blueshift. When a star is moving away, its wavelengths are expanded or stretched, causing a redshift. A redshift is also seen in the light from distant galaxies, but not explained in the same way. The Hubble redshift explains the shift in wavelength of light coming from distant galaxies. This is caused by the stretching of space as the universe expands. Light waves traveling through space lengthen as space expands.
Scientists have thought that the universe was made up of regular matter. The problem with this theory is that if the universe was made up of regular matter, galaxies such as The Milky Way could not be rotating, moving, or interacting. The universe does in fact contain a little of regular matter but what it does mostly contain is dark matter. This matter is unseen and not understood very well but explains the movement in galaxies. Although they are still uncertain what dark matter is, it explains how the universe may have formed. Temperature variations may have led to density fluctuations in the earlier universe. Gravity from dark matter pulled together making regions with higher density, then galaxies could have formed in these denser regions.
There are also theories that while the universe is expanding it is also accelerating. This is acceleration is called dark energy. Earlier in the universe, matter was closer together and gravity could overcome expansion caused by dark energy. Now, the matter is farther apart and gravity is forced to overcome it and expansion accelerates. Dark matter and dark energy are however not related.
Q1: How does dark matter help galaxies?
Q2: When a star is moving towards earth it causes a...
Q3: Who introduced the big bang theory?
Q4: When the universe started it was very hot and dense, but as it expanded and aged what happened?
Q5: What was the estimated time that the big bang started?