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Author Question: The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in ... (Read 146 times)

cnetterville

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on: Jul 27, 2018
The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in the Milky Way is with ________.
 
  A) radio telescopes observing at a wavelength of 21 centimeters
  B) X-ray telescopes
  C) space-based ultraviolet telescopes
  D) ground-based visible-light telescopes

Question 2

To calculate the masses of stars in a binary system, we must measure their ________.
 
  A) luminosities and distance from Earth B) orbital period and average orbital distance
  C) absolute magnitudes and luminosities D) spectral types and distance from Earth


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marict

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

A

Answer to Question 2

B


cnetterville

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Reply 2 on: Jul 27, 2018
Gracias!

at

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Reply 3 on: Yesterday
Wow, this really help

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