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level: The Origin of the Universe

Questions and Answers List

level questions: The Origin of the Universe

QuestionAnswer
What Evidence is there for the Universe to be Expanding? Start from the Beginning-Note that Different Elements will Absorb Different Frequencies of VL -And each Element will make its own Specific Pattern of Lines that it Absorbs in the Visible Part of the Spectrum -Light from other Galaxies have the Same Pattern, but at Lower Frequencies. This is called Red-Shift as the Lines are moving Towards the Red End of the Spectrum -And Red Shift Measurements tells us that All the Distant Galaxies are moving AWAY from us Rapidly. Further Galaxies = Greater Red Shift. -So Further away Galaxies are moving Faster from the Nearest Ones, giving Evidence that the Universe is Expanding
What exactly is the CMBR? Where did it even Come From?-CMBR --> Cosmic Microwave Background Radiation. -This is simply Microwave Radiation coming from Anywhere and is Everywhere in the Universe. [Remember - Background Radiation?] -This all Began because of the Big Bang - and as the Universe Expanded - the Background Radiation had 'cooled' and dropped its Frequency.
So how did the Universe even Start?-If the Galaxies had to be Moving away from Each Other at Speed, then Something had to have Happened for them to do such a Thing -That 'thing' was the Big Bang [This is NOT an Explosion] -And the CMBR is just the Leftover Energy from the Beginning. Cool.
What really happened in the Big Bang?-All the Matter in the Universe was at a Single Point -Then, it Expanded Rapidly [NOT an Explosion] -Space itself has not Stopped and so the Expansion Continues.