The US space office's Perseverance wanderer is presently only three weeks from showing up at Mars.
The robot and the Red Planet are as yet isolated by some 4.5 million km (3 million miles), yet this hole is shutting at a fast rate.
The greatest, most refined vehicle ever shipped off land on another planet, the Nasa robot is being focused at a close tropical cavity called Jezero.
Score is normal presently before 2100 GMT on Thursday 18 February.
To get down, the Nasa meanderer should endure what architects call the "seven minutes of fear" - the time it takes to get from the highest point of the air to the surface.
The "fear" is a reference to the overwhelming test that is characteristic in attempting to lessen a section speed of 20,000km/h to something like strolling pace right now of "wheels down".
"At the point when the researchers take a gander at our arrival site, Jezero Crater, they see the logical guarantee of everything: the remaining parts of an old stream streaming in and streaming out of this hole and imagine that is the spot to go to search for indications of previous existence. Be that as it may, when I take a gander at Jezero, I see risk," says Allen Chen, the architect who drives the Entry, Descent and Landing (EDL) exertion for Perseverance.
"There's threat all over the place. There's this 60-80m-tall bluff that slices directly through the center of our arrival site. In the event that you look toward the west, there are holes that the wanderer can't escape regardless of whether we were to land effectively in one of them. Also, in the event that you look toward the east, there are huge rocks that our meanderer would be extremely troubled about on the off chance that we put down on them," he disclosed to BBC News.
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media caption"Dare strong things": Watch how Perseverance's arrival ought to continue
Luckily, Perseverance has some attempted and tried innovations that ought to guarantee it arrives at a protected point on a superficial level. Among them is the celebrated "Skycrane" stream pack that effectively handled Nasa's past meanderer, Curiosity, eight years prior.
There are even a few augmentations intended to improve dependability. The parachute framework that eases back the barometrical plummet from super-to sub-sonic velocities presently has something many refer to as "range trigger". This all the more absolutely times the kickoff of the parachute to carry the meanderer nearer to its notional bulls-eye.
Dissimilar to Curiosity which just opened the chute when it arrived at a pre-decided speed, Perseverance will check its environmental factors first prior to giving the order.
Partnered to this is Terrain Relative Navigation. Tirelessness will look at the ground beneath and checking it against satellite symbolism of the pit to all the more likely measure its position.
It resembles you or I peering out the window of our vehicle and afterward glancing back at a guide to see where we are, says Chen.
"That is the thing that we're requesting that Perseverance do all alone, to sort out where she is, and afterward fly to known safe spots that are close by."
media captionKen Farley: "How pervasive may life be past Earth?"
Interest figured out how to land about a mile from the notional bulls-eye. It overshot marginally. Persistence, with its upgraded landing innovations, ought to improve.
Researchers have just named the zone that incorporates the bulls-eye. It's called Timanfaya, named after the Spanish public park in Lanzarote, one of the Canary Islands.
The Lanzarote Timanfaya is a volcanic landscape; the Martian variant, which incorporates a 1.2km by 1.2km square probably likewise incorporates some volcanic stone. It's the floor of Jezero Crater.
Albeit this is the arrival recognize, it's not the significant interest for the mission. That is the leftover delta just toward the north, alongside some more inaccessible carbonate rocks which the scientists think may follow the edge of a once enormous lake in Jezero.
"Carbonate rock is amazingly plentiful on Earth, however is very uncommon on Mars and we're not quite certain why that is," says Ken Farley, the Nasa project researcher on Perseverance.
"There's an area on the edge of the pit that would have been the shore with a high grouping of carbonate. This is exceptionally appealing to us, on the grounds that on Earth carbonate regularly is hastened [by living organisms]: individuals will be acquainted with things like coral reefs. Furthermore, it is a decent method to record bio-marks," he revealed to BBC News.
The fantasy is Perseverance will unearth fossil proof of stromatolites. These are sedimentary stores that have been worked by layers, or tangles, of miniature creatures.
The constructions, and the science inside them, is conspicuous to geologists. All things considered, we are discussing rocks in Jezero that are very nearly four billion years of age.
Disclosures are probably not going to be of the sure thing assortment, which is the reason Perseverance will bundle up its most intriguing finds for later missions to recover and take back to Earth for more itemized study.
Farley says Perseverance will pose the most essential of inquiries and whatever answers its produces will be informative.
"Is it an instance of in the event that you fabricate a livable climate, at that point life will come? Or on the other hand is it like a wizardry flash that additionally needs to occur? Also, the response to that question is truly significant, in light of the fact that we currently realize that there are billions, in a real sense billions, of planets out there past Earth.
"What is the probability that life doesn't exist out there? It appears little to me, yet everything relies on how universal that flash is that gets life moving," he clarified.
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