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Author Question: Who invented the galaxy classes, and what three major groups did he invent? What will be an ideal ... (Read 24 times)

jman1234

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on: Jul 27, 2018
Who invented the galaxy classes, and what three major groups did he invent?
 
  What will be an ideal response?

Question 2

On average, how often do impacts large enough to produce mass extinction on the Earth occur?
 
  A) once every century
  B) once every million years
  C) once in Earth's history
  D) once every thousand years
  E) once every hundred million years


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randomguy133

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

Edwin Hubble divided the galaxies into S (spirals), E (ellipticals) and Irr (irregulars).

Answer to Question 2

E


jman1234

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Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

dreamfighter72

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Reply 3 on: Yesterday
Excellent

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