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Even though some authors argued that this is sufficient to demonstrate the isotropy of the one-way speed of light, [10] [11] it has been shown that such experiments cannot, in any meaningful way, measure the (an)isotropy of the one-way speed of light unless inertial frames and coordinates are defined from the outset so that space and time ...
Extra-close oppositions of Mars happen every 15 to 17 years, when we pass between Mars and the Sun around the time of its perihelion (closest point to the Sun in orbit). The minimum distance between Earth and Mars has been declining over the years, and in 2003 the minimum distance was 55.76 million km, nearer than any such encounter in almost ...
The lowest energy transfer to Mars is a Hohmann transfer orbit, which would involve a roughly 9-month travel time from Earth to Mars, about 500 days (16 mo) [citation needed] at Mars to wait for the transfer window to Earth, and a travel time of about 9 months to return to Earth. [9] [10] This would be a 34-month trip.
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For the middle of the journey the ship's speed will be roughly the speed of light, and it will slow down again to zero over a year at the end of the journey. As a rule of thumb, for a constant acceleration at 1 g (Earth gravity), the journey time, as measured on Earth, will be the distance in light years to the destination, plus 1 year. This ...
For example, if a signal were received on Earth at exactly 11:00 UTC from a spacecraft showing that it had just completed a maneuvering thrust, but the spacecraft was four light-hours away from Earth (the distance of the New Horizons spacecraft at one point as it approaches Pluto), the SCET time of the thrust maneuver would have been four hours ...
Sep. 7—In the 2011 science fiction novel The Martian, the stranded Mark Watney spent more than 500 Earth days on the red planet. The Curiosity rover has got him beat, eightfold. Twelve years ...
[10] [11] Due to the effect of librations and the parallax due to the close distance of Phobos, by observing at high and low latitudes and observing as Phobos is rising and setting, the overall total coverage of Phobos's surface that is visible at one time or another from one location or another on Mars's surface is considerably higher than 50%.
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