Mars InSight landing – as it happened: Nasa lander touches down on Red Planet

It's important to remember that, based on previous attempts, today is far more likely to fail than succeed. Most landers have failed to safely land on Mars for one reason or another. It is a tough trip: flying through the thin atmosphere at hypersonic speed and aiming to land softly on the ground.

Here's what that journey will look like as InSight floats to the ground.

And here's what will happen as it actually arrives on the surface.

All of that, of course, is presuming everything goes well. In reality, those jets of balancing thrusters might not be there – in which case InSight will smash into the ground and end up a crumpled useless mess, like so many of the landers that went before it.

Everything happens about noon pacific, 3pm eastern, or 8pm in the UK.

If you're wanting to watch along, Nasa will be hosting live coverage on its TV channel. But you can also go to in-person events, which are happening in places such as Times Square and across the world. There's a full list of them on Nasa's website, here.

If you want a quick catch up, here's everything you need to know about today's big landing 

Here's a little wrap up of what's going to happen this evening, and those seven minutes that will decide whether we get new insights into what's going on inside Mars or just another hunk of useless metal splayed on its surface.

What are we actually doing all of this for? Here's some sort of explanation.

Here's a little piece about the UK technology that's about to land on Mars, courtesy of Press Association:

An American spacecraft carrying millions of pounds worth of UK technology is set to land on Mars on Monday night.

The InSight probe is due to touch down on the Red Planet at around 8pm GMT, slowing its speed from 12,500mph to a 5mph jogging pace in just seven minutes.

It will then deploy instruments designed to probe beneath the Martian surface and collect information about the planet's deep structure.

Three instruments designed and built in the UK are included in the spacecraft's seismic package, which will listen out for "Marsquakes".

Over the course of two years, scientists expect to detect between a dozen and 100 of the tremors, which could range up to six on the Richter scale.

The UK Space Agency has invested £4 million in the probe's short period seismometer (SEIS-SP).

Sensors for the instrument developed at Imperial College London and Oxford University can detect motion at sub-atomic scales.

The UK team, led by Professor Tom Pike at Imperial, said: "We should be listening for Marsquakes for at least two years, and we hope considerably longer.

"It is critical that we set down the instrument in the best place to ensure we're stable, and then follow up with adding a cover to shield our sensors from the wind."

Colleague Dr Neil Bowles, from Oxford University's Department of Physics, said: "The InSight SEIS-SP seismometer is one of the most sensitive and challenging instruments we have worked on for spaceflight in Oxford."

Only around four in 10 missions ever sent to the Red Planet have been successful - and they have all been US spacecraft.

The European spacecraft Schiaparelli smashed into the planet in 2016 after switching off its retro-rockets too early, scientists believe.

It was testing the landing system for a British-built rover to be launched on the second phase of the ExoMars mission in 2020.

The thin Martian atmosphere means there is hardly any friction to slow down spacecraft.

InSight will rely on small rockets, parachutes, heat shields and shock-absorbing legs to manage the deceleration and ensure a soft landing on an equatorial region called Elysium Planitia.

If successful, the three-legged probe will help scientists learn about how rocky worlds like the Earth and Moon formed more than 4.5 billion years ago.

Lori Glaze, acting director of the Planetary Science Division at the American space agency Nasa, said: "Once InSight is settled on the Red Planet and its instruments are deployed, it will start collecting valuable information about the structure of Mars' deep interior - information that will help us understand the formation and evolution of all rocky planets, including the one we call home."

InSight was launched from California on May 5.

The mission coincides with the discovery of a 12-mile lake of water beneath the southern Martian ice cap earlier this year.

An orbiting European probe found the lake using ground-penetrating radar. The presence of a large body of liquid water on Mars has major implications for the chances of life surviving on the planet.

The European ExoMars Trace Gas Orbiter (TGO), which is currently circling Mars, will be used to "sniff" any gases released by seismic events detected by InSight.

TGO scientist Dr Manesh Patel, from the Open University, said: "This could potentially provide a way to unlock the secrets to what hides beneath the Martian surface."

InSight stands for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport.

And here's the latest from the ground where everyone's a little anxious (via AP):

A NASA spacecraft is just a few hours away from landing on Mars. 

The InSight lander is aiming for a Monday afternoon touchdown on what scientists and engineers hope will be a flat plain. 

Everyone involved in the $1 billion international mission is understandably nervous. They say they've had trouble sleeping, and their stomachs are churning. 

It's risky business to descend through the Martian atmosphere and land, even for the U.S., the only country to pull it off. It would be NASA's eighth landing on Mars.

Again, just to re-iterate, this is very nervy stuff.

The lander has to go from 12,300mph in just six minutes, all while ejecting a parachute, firing the engines that will keep it slow and flat, and attempting to ensure it lands somewhere on all its three legs. And it has to make sure it drops down somewhere reasonably comfortably, preferably flat and with few rocks.

We've not had great success at this. Only 40 per cent of attempts from Earth to land on Mars have succeeded.

There's about an hour until the big moment, which comes at roughly 8pm UK time. There'll be a landing of a kind, but it remains to be seen whether it's a touchdown or a let down.