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The standard candle method
If we know the intrinsic brightness of an object in space - that is, how bright an object really is - then we can estimate its distance from how bright it appears to us from Earth.
- One type of standard candle is a 'Cepheid variable'. Cepheid variables are a type of star that has a consistent relationship between their intrinsic brightness and how fast they pulsate. (If it pulsates at x speed, you know its intrinsic brightness is y.)
- Supernovae is another kind of standard candle and allows astronomers to calculate to the standard candle's home galaxy.
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The ‘Hubble-Lemaître’ law
The 'Hubble-Lemaître' law is more useful for calculating distant galaxies. The law shows that the further the galaxy is from Earth, the faster it moves away from us - the consequence of the Universe expanding.
The galaxy's speed is measured by...
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The ‘Hubble-Lemaître’ law
The 'Hubble-Lemaître' law is more useful for calculating distant galaxies. The law shows that the further the galaxy is from Earth, the faster it moves away from us - the consequence of the Universe expanding.
The galaxy's speed is measured by...
The Expected Value Method
- Break your time out by task.
- Find a unit of measurement that connects the tasks you work on with the income you earn.
- Estimate the expected value of each task.
- Add all the expected values together to calculate the total expected value of your time.
- Add extra v...
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