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Author Question: Two stars, Betty and Wilma, are both on the main sequence. Betty is more luminous than Wilma. ... (Read 87 times)

Awilson837

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on: Jul 27, 2018
Two stars, Betty and Wilma, are both on the main sequence. Betty is more luminous than Wilma.
 
  Which one has a hotter surface temperature? Which one is more massive? Which one is bigger? If they both formed at the same time, which one will evolve off the main sequence first?

Question 2

Process of Science: What evidence is there of a subsurface ocean on Europa? Do you find it compelling?
 
  What will be an ideal response?


joneynes

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

Since they are both on the main sequence but Betty is more luminous than Wilma, Betty must be located higher up on the main sequence. Therefore, Betty has a hotter surface temperature, is more massive, and has a larger radius. Betty will also evolve faster than Wilma, and if they were formed at the same time Betty will turn off the main sequence first.

Answer to Question 2

The main evidence comes from trying to find a mechanism to explain Europa's magnetic field variation. It appears to be due to an induced field, possibly from a conducting substance, such as a salty subsurface ocean.


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