Some of the Interstellar Gas in Our Galaxy Has Been

question 12

Multiple Choice

Some of the interstellar gas in our Galaxy has been heated to millions of degrees, a temperature that surprised astronomers when it was first discovered. How do we now think that gas between stars gets that hot?

• A) any gas close to a star will naturally get that hot
• B) very powerful shock waves from exploding stars heat the gas they come into contact with
• C) gas gets to be this hot when hydrogen atoms flip their spin and give off 21-cm radiation
• D) such gas is heated by the radiation given off by complex molecules in clouds
• E) astronomers have no idea how gas gets this hot; this is an unsolved mystery in astronomy

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