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Author Question: Astronomers believe that some of the abundant water on Earth arrived late in the formation process ... (Read 153 times)

CQXA

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on: Jul 27, 2018
Astronomers believe that some of the abundant water on Earth arrived late in the formation process as a bombardment of _______________.
 
  Fill in the blank(s) with correct word

Question 2

As a main sequence star evolves off the main sequence, the helium core is contracting while the outer envelope is _______________.
 
  Fill in the blank(s) with correct word


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Sammyo

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

comets
icy planetesimals
icy comets

Answer to Question 2

expanding


CQXA

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Reply #2 on: Jul 27, 2018
TY


Sammyo

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Reply #3 on: Jul 27, 2018
You're welcome


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