Rick Merrill wrote:
Philip TAYLOR wrote:
Rick Merrill wrote:
It takes 15 minutes for messages to get from Mars to Earth.
Mars is (on average) 45 000 000 miles from Earth;
the speed of light is 186,000 miles a second;
it would therefore take approximately 240 seconds for a message to get
from Mars to
Earth;
240 seconds is 4 minutes;
From where did you get your figure of 15 minutes ?
Philip Taylor
Ah, Phil, from Jay Leno !-) It is his joke. Yes, it's a joke, Philip!
And, Phil, I should have said 14 minutes: here is a URL
http://science.time.com/2012/08/09/what-the-curiosity-rover-can-teach-us-about-mars-and-earth/
"The Earth and Mars were about 154 million miles (248 million km) apart,
which meant the transit time for a message was 13 minutes and 48 seconds."
You see, information travels the Actual distance, not the Average
distance;-)
From the linked article:-
" If the rover crashed — a real possibility considering it would be
slamming into the atmosphere at 13,000 mph (921,000 k/h),"
I hope it wasn't someone from NASA that did that maths, as I believe
there is only 1.609km per mile, so 13,000 mph would only be 21,000 k/h
approx!!!
(Wonders where the extra 900,000 k/h came from!!)
--
Daniel
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