A cosmic collision: Two satellites due to smash into surface of the moon… but don't worry, it was all planned by Nasa

NASA has deliberately guided the twin satellites into a cliff close to the moon’s northern pole

Two Nasa satellites will slam into the surface of the moon later today as they finish their 15-month lunar gravity measuring mission.

Nasa has deliberately guided the twin satellites, nicknamed Ebb and Flow, into a cliff close to the moon’s northern pole. The crash site has been chosen to avoid areas of historical significance, such previous moon landing locations.

Despite an estimated impact speed of 3,760mph, the impact is unlikely to be visible from earth, as the satellites are only about the size of a home washing machine and are carrying little or no fuel.

The crash marks the conclusion of the highly successful $496 million Grail mission, which launched in September 2011 to map the moon’s gravity field in unprecedented detail.

Maria Zuber, Grail’s principal investigator, told reporters: “Grail has produced the highest-resolution, highest-quality gravity field for any planet in the solar system, including Earth.”

According to Space.com, the resulting map revealed a pulverised lunar crust which suggests that the moon, Earth, Mars, Mercury and Venus have been pounded by impacts far more violently than previously thought.

With the two satellites running out of fuel, a collision with the moon’s surface was inevitable, so scientists opted for a controlled impact into an insignificant area.

On Friday morning the satellites’ control panels were switched off and scientists ordered the low-flying spacecraft to crash into the rim of a crater.

The impact is set to take place at 22.58 GMT, with the craft expected to create small holes in the moon surface but leave little other trace.

“They're going to be completely blown apart at the time,” said Grail mission manager David Lehman of Nasa's Jet Propulsion Laboratory in Pasadena, California.

Not content with the satellites’ successful gravitational mapping, scientists are hoping the impact itself will be something of a research mission.

There is hope that as the satellites slam into the moon’s surface, ice or other volatile material will be ejected into the atmosphere where it can be detected.

But the Grail team doesn't necessarily expect to see ice. The crater rim is in sunlight much of the time, and the craft aren't large enough to kick up much material.

News
John Travolta is a qualified airline captain and employed the pilot with his company, Alto
people'That was the lowest I’d ever felt'
Life and Style
healthIt isn’t greasy. It doesn’t smell. And moreover, it costs nothing
News
i100

Other places that have held independence referendums
Arts and Entertainment
Pharrell dismissed the controversy surrounding
musicThe singer said 'the last thing I want to do is degrade'
PROMOTED VIDEO
News
news

Sport
footballThe latest scores and Twitter updates from tonight’s games, featuring Bayern Munich vs Man City and Chelsea vs Schalke
News
A male driver reverses his Vauxhall Astra from a tow truck
newsThe 'extremely dangerous' attempt to avoid being impounded has been heavily criticised
News
peopleThe Times of India said actress should treat it as a 'compliment'
Arts and Entertainment
Jack Huston is the new Ben-Hur
film

It scooped up an unprecedented 11 Academy Awards when it was first remade in 1959

News
news

Watch this commuter wage a one-man war against the Circle Line
News
ebooksAn unforgettable anthology of contemporary reportage
Property
Home body: Badger stays safe indoors
lifeShould we feel guilty about keeping cats inside?
Life and Style
fashion

Olympic diver has made his modelling debut for Adidas

Arts and Entertainment
Toby Jones (left) and Mackenzie Crook in BBC4’s new comedy The Detectorists
tvMackenzie Crook's 'Detectorists' makes the hobby look 'dysfunctional', they say
Arts and Entertainment
Maxine Peake plays Hamlet at Manchester's Royal Exchange
theatreReview: Maxine Peake brings emotional ferocity to Shakespeare's starring part
Extras
10 best table lamps
indybest
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

IT Project Manager (technical, applications, infrastructure)

£55000 - £60000 Per Annum + benefits: Clearwater People Solutions Ltd: IT Proj...

English Teacher (Bristol and South Gloucestershire)

Negotiable: Randstad Education Bristol: English teachers for day to day cover,...

Teacher

Negotiable: Randstad Education Sheffield: Year 6 Teacher RequiredThis teaching...

SharePoint Administrator - Bishop's Stortford / Stansted

£30000 - £35000 per annum: Ashdown Group: SharePoint Administrator - Bishop's ...

Day In a Page

Mystery of the Ground Zero wedding photo

A shot in the dark

Mystery of the wedding photo from Ground Zero
His life, the universe and everything

His life, the universe and everything

New biography sheds light on comic genius of Douglas Adams
Save us from small screen superheroes

Save us from small screen superheroes

Shows like Agents of S.H.I.E.L.D are little more than marketing tools
Reach for the skies

Reach for the skies

From pools to football pitches, rooftop living is looking up
These are the 12 best hotel spas in the UK

12 best hotel spas in the UK

Some hotels go all out on facilities; others stand out for the sheer quality of treatments
These Iranian-controlled Shia militias used to specialise in killing American soldiers. Now they are fighting Isis, backed up by US airstrikes

Widespread fear of Isis is producing strange bedfellows

Iranian-controlled Shia militias that used to kill American soldiers are now fighting Isis, helped by US airstrikes
Topshop goes part Athena poster, part last spring Prada

Topshop goes part Athena poster, part last spring Prada

Shoppers don't come to Topshop for the unique
How to make a Lego masterpiece

How to make a Lego masterpiece

Toy breaks out of the nursery and heads for the gallery
Meet the ‘Endies’ – city dwellers who are too poor to have fun

Meet the ‘Endies’ – city dwellers who are too poor to have fun

Urbanites are cursed with an acronym pointing to Employed but No Disposable Income or Savings
Paisley’s decision to make peace with IRA enemies might remind the Arabs of Sadat

Ian Paisley’s decision to make peace with his IRA enemies

His Save Ulster from Sodomy campaign would surely have been supported by many a Sunni imam
'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

Exclusive extract from Janis Winehouse's poignant new memoir
Is this the role to win Cumberbatch an Oscar?

Is this the role to win Cumberbatch an Oscar?

The Imitation Game, film review
England and Roy Hodgson take a joint step towards redemption in Basel

England and Hodgson take a joint step towards redemption

Welbeck double puts England on the road to Euro 2016
Relatives fight over Vivian Maier’s rare photos

Relatives fight over Vivian Maier’s rare photos

Pictures removed from public view as courts decide ownership
‘Fashion has to be fun. It’s a big business, not a cure for cancer’

‘Fashion has to be fun. It’s a big business, not a cure for cancer’

Donatella Versace at New York Fashion Week