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For over 5 years Curiosity has been successfully searching for many signs that water was once present at Gale crater. Its geology is notable for containing both clays and sulfate minerals that may preserve signs of past life. An unusual feature of Gale is an enormous mound of "sedimentary debris" around its central peak that is composed of layered material This mound may have been laid down over a period of 2 billion years, billions of years ago and is of particulary interest.

But now that the surroundihgs of the peak have been investigated for so much longer than was expected before, isn't it time to look for signs of past life elsewhere ?

At the image below, with the landing site of Curiosity we can see there has been substantial waterflow from the rim of the crater through the Peace Vallis outflow channel into the plain. An alluvial fan is drawn at the image that could be much "younger" than the "debris" that is already been so thoroughly investigated.

Opportunity is allowed to explore "Perseverance Valley" on the west rim of Endeavour Crater!

So, why not turn the wheels and head for Peace Vallis?

Image from: https://commons.wikimedia.org/wiki/File:PIA16158-Mars_Curiosity_Rover-Water-AlluvialFan.jpg

Mars_Curiosity_Rover-Water-AlluvialFan

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  • $\begingroup$ @PearsonArtPhoto Added information about Opportunity which questions your answer. $\endgroup$ – Conelisinspace Jun 6 '18 at 12:08
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It is actually too likely to find water there. There are 3 categories of Planetary Protection missions for a mission to Mars, IVa, IVb, and IVc. Curiosity meets the IVa criteria, a mission not intended to seek life on Mars. A IVb mission looks for life, and a IVc enters a special region which is:

A special region is a region classified by COSPAR where terrestrial organisms could readily propagate, or thought to have a high potential for existence of Martian life forms. This is understood to apply to any region on Mars where liquid water occurs, or can occasionally occur, based on the current understanding of requirements for life.

The definition has also been further clarified. The basic intent seems to be regions that could have water, and are above freezing. An area with alluvial fans certainly might have water, and the region does not freeze, thus a IVc mission would be required to visit such areas more closely, of which Curiosity is not.

One particular thing of attention was the occurrence of Recurring Slope Lineae only a few km away from Curiosity. The current path has Curiosity getting close to, but not too close to, these areas where there might be liquid water. Planetary Protection was a prime suspect at first, but it has been loosened at least slightly.

It might be that by the time Curiosity has scaled Mount Sharp they will consider other targets, and it might be deemed a target that is worthy of approaching closer. But Planetary Protection is a huge concern for the Curiosity team, now more so then ever.

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    $\begingroup$ That is a whole different question, but the thought basically is that the UV radiation will kill anything on the surface, unless it can get in to the subsurface somehow. $\endgroup$ – PearsonArtPhoto Mar 28 '18 at 18:26
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    $\begingroup$ After so many years been 'sterilized' on Mars, could not Curiosity been declared as part of a IVc mission ? $\endgroup$ – Conelisinspace Mar 28 '18 at 19:06
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    $\begingroup$ Isn't it likely that after so many years the alluvial fan has already been contaminated by the winds coming from the direction of Curiosity ? $\endgroup$ – Conelisinspace Mar 28 '18 at 19:10
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    $\begingroup$ @Conelisinspace, experiments with microbes have intentionally been mounted on the outside of the space station to see how they fare in the vacuum, radiation, etc. Even after a year microbes were found to be alive. $\endgroup$ – NeutronStar Mar 28 '18 at 21:38
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    $\begingroup$ Money. Sterilization at that level is very expensive. That might be worthy of a new question. $\endgroup$ – PearsonArtPhoto Mar 28 '18 at 22:54
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From a geological point of view, Curiosity is just well underway with it's journey within the surroundings of Mount Sharp.
It is believed that this layered mountain is the remnant of an extensive sequence of deposits that once filled in the crater, so the closer you get to the peak, the "younger" the surface will be.

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