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Author Question: In design, most radio telescopes, like Arecibo, are ________. Fill in the blank(s) with correct ... (Read 123 times)

futuristic

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on: Jul 27, 2018
In design, most radio telescopes, like Arecibo, are ________.
 
  Fill in the blank(s) with correct word

Question 2

Briefly explain why white-dwarf supernovae are useful for measuring cosmic distances.
 
  What will be an ideal response?


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amit

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Reply #1 on: Jul 27, 2018
Answer to Question 1

prime focus reflectors

Answer to Question 2

They all come from explosions of white dwarfs that reach the white-dwarf limit of 1.4 solar masses. As all white dwarf progenitors have the same mass, we expect them all to have the same luminosity. Observations of white-dwarf supernovae for which we can measure distance independently confirm that they all have the same luminosity. Because we know their luminosities, we can use their apparent brightnesses to determine their distances from the luminosity-distance formula. Another advantage is that white dwarf supernova can be as bright as entire galaxies so that they can be detected in very distant galaxies.


futuristic

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


amit

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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