This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in ... (Read 138 times)

cnetterville

  • Hero Member
  • *****
  • Posts: 547
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

marict

  • Sr. Member
  • ****
  • Posts: 304
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

B


cnetterville

  • Member
  • Posts: 547
Reply 2 on: Jul 27, 2018
Excellent

matt95

  • Member
  • Posts: 317
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Primary, secondary, and tertiary endosymbiosis. Primary, secondary, and tertiary endosymbiosis.
Electron atomic and molecular orbitals Electron atomic and molecular orbitals
Primary School Attendance in World Regions Attending primary school is common but not universal, wo Primary School Attendance in World Regions Attending primary school is common but not universal, wo
Levels of protein structure: Primary structure Levels of protein structure: Primary structure
Primary Groups: Families Primary Groups: Families
The molecular structure of methanol showing the one carbon atom, four hydrogen atoms, and one ... The molecular structure of methanol showing the one carbon atom, four hydrogen atoms, and one ...
Video: Fetal development - Weeks 9 to 38

For a complete list of videos, visit our video library