# The distance to mars is 7.5 x 1010 meters how long does it take for a radio signal from mars pathfinder to be received by nasa on earth?

light travels at approximately 300,000,000 m/s, so to pass 7.5*1010 meters it would take: 7.5*1010/300,000,000=250 seconds = 4.167 minutes P.S. Mars is not that close, in real life the signal ta... Read More »
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## How many Earth days does it take to orbit Mars?

In 1971, Mariner 9 became the first spacecraft to successfully orbit the planet Mars. It was the first time a planet besides Earth was orbited. Mariner 9 orbited Mars twice a day, taking one-half o... Read More »
http://www.answerbag.com/q_view/2440982

## Does benadryl make you sleepy If so how long does it take before it kicks in And how long will i sleep?

Yes. It makes you sleepy. As a chronic insomniac I would take it to get sleepy. Except for prescription sleeping pills, which the doctors don't like to let you have on a nightly basis and due to th... Read More »
http://answers.yahoo.com//question/index?qid=20081230112154AAHeQtG

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