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6 Cards in this Set
- Front
- Back
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What is the big bang theory? |
The Big Bang theory is an effort to explain what happened at the very beginning of our universe. Prior to that moment there was nothing; during and after that moment there was something: our universe. The big bang theory is an effort to explain what happened during and after that moment |
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What is the actual theory of the big bang? |
According to the standard theory, our universe sprang into existence as "singularity" around 13.7 billion years ago.Black holes are areas of intense gravitational pressure. After its initial appearance, it apparently inflated (the "Big Bang"), expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. |
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What is supporting evidence of the big bang? |
The redshift of distant galaxies means that the Universe is probably expanding. If we then go back far enough in time, everything must have been squashed together into a tiny dot. The rapid eruption from this tiny dot was the Big Bang. |
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What is the "Red Shift"? |
The further away a galaxy is, the faster it appears to be moving, and hence the more the spectrum is red shifted The displacement of spectral lines towards longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects. This is interpreted as a Doppler shift which is proportional to the velocity of recession and thus to distance. |
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What is the Doppler effect? |
Is an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers. |
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What is the life cycle of a star? |
1) Stellar nebula-Average Star-Red Giant-Planetary Nebula-White dwarf- Black dwarf. 2) Stellar nebula- Massive Star- Red Super giant- Super Nova- Neutron star or black hole. |
