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Radio waves are electromagnetic.Right?

  1. May 28, 2008 #1
    Radio waves are electromagnetic.Right??

    "Phoenix was on track for anticipated entry into the atmosphere at 4:30p.m. Pacific Time and reaching the surface at 4:38 p.m., although confirmation of those events comes no sooner than 15 minutes, 20 seconds later, due to the time needed for radio signals to travel from Mars to Earth."
    source:
    http://www.kintera.org/cms.asp?id=5...nLXK6OBLXLuKJXdP9OXI3PGKdLOLXPHE&auid=3696421

    But light takes just 8 minutes to reach earth from the sun, and here radio waves are taking 15.Is Mars farther than the sun from earth at present??
     
  2. jcsd
  3. May 28, 2008 #2

    D H

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    Staff Emeritus
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    Yes. That is characteristic of a Hohmann type transfer. You target the vehicle two arrive when the planets are in opposition.
     
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