How far away is Mars, why is the planet red and how long does it take to get there?
Nasa's InSight probe which has just landed on Mars as sparked once again a huge interest in the Red Planet
Mars, the fourth planet from the Sun in our galaxy, has enthralled stargazers for centuries and is named after the Roman god of war.
Nasa’s Insight probe has landed on the planet in an attempt to find out more about what is bellow the planet’s surface.
While theoretically the closest the two planets can get due to their orbits is 33.9m but this has never been recorded – the closest being is 34.8m miles.
The furthest they can be is 250m miles, making the average 140m miles.
The fastest spacecraft launched from Earth was Nasa’s New Horizons mission.
The probe left Earth at a speed of 36,000mph.
If a similar probe left in a direct line to mars, the quickest it could possibly do the journey in is 39 days although the quickest that has been achieved so far is 41 days.
On average it would take 162 days.
That’s the theory but other factors have to be taken into account, like the two planets are continually moving so if a probe was sent in a direct line when the two were as close as possible, by the time the probe reached Mars, it would have moved.
Calculations have to consider where the planet will be when the probe reached Mars.
Another factor is that a probe would have to slow down as it neared Mars otherwise it would simply smash into the planet.
Economics is also a factor – the faster a spacecraft travels the more fuel it burns up which has to be carried on board which will make the craft heavier and it might not be actually possible to carry so much fuel as it hurtles through space.