Radio waves are electromagnetic.Right?

  • #1

Main Question or Discussion Point

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=595271&campaign_id=34109&msource=08008&tr=y&enString=ggQESAWvLrKTL1MGKnLXK6OBLXLuKJXdP9OXI3PGKdLOLXPHE&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??
 

Answers and Replies

  • #2
D H
Staff Emeritus
Science Advisor
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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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