The of a star depends on it's and how it is from Earth, the of a star being the it gives out in the form of . The luminosity of a star depends on the and of the star - the / it is, the the it's luminosity. If a star is further away, it will appear dimmer.
Cepheid Variables are which . They get and over the course of .
Tick the correct statements about Cepheid Variables:
How quickly they pulse is inversely proportional to their luminosity
How quickly they pulse is directly linked to their luminosity
The greater the luminosity, the longer the time between pulses
The lower the luminosity, the less time there will be between pulses
Astronomers can work out the to a star by comparing it's with it's .
Curtis believed that: • The ❌ was made-up of ❌ • The ❌ was at the ❌ of our galaxy • Our galaxy was ❌ • ❌ were ❌ galaxies, ❌ the Milky Way
Shapley believed that: • The Universe was ❌, ❌ across • He also believed that the ❌ and the ❌ were ❌ from the centre of the Universe. • He believed that nebulae were ❌ and that these clouds were ❌ and ❌ of the Milky Way.
With cepheid variables, the greater the luminosity, the longer the time between pulses.
Scientists can work out the to a star by comparing and . Luminosity is worked out using the .
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