Where did Earth’s water come from?


Sarwat Nasir
  • English
  • Arabic

Space dust grains may have carried water to Earth as the planet formed, a new study has found.

For decades, scientists have been trying to learn the source of Earth’s oceans, which cover 71 per cent of the planet.

It was always believed that water-carrying space rocks, known as C-type asteroids, could have brought water 4.6 billion years ago.

Now, a study by an international team of scientists shows that there could be more than one source.

A team led by the University of Glasgow studied samples from Itokawa, a small S-type asteroid, collected by Japanese space probe Hayabusa, which returned to Earth in 2010.

A fragment of the Itokawa asteroid studied by the international team of scientists. Photo: University of Glasgow
A fragment of the Itokawa asteroid studied by the international team of scientists. Photo: University of Glasgow

Solar wind played a part

The findings, published in the Nature Astronomy journal, showed a significant amount of water was produced below the surface of dust-sized grains from Itokawa by space weathering – which occurs when charged particles from the Sun, known as solar wind, change the chemical composition of the grains to produce water molecules.

Research suggests that this water-rich dust would have rained down alongside the C-type asteroids and created the Earth’s oceans.

“As recently as a decade ago, the notion that solar wind irradiation is relevant to the origin of water in the solar system, much less relevant to Earth's oceans, would have been greeted with scepticism,” said Prof John Bradley of the University of Hawaii at Manoa, Honolulu, a co-author of the paper.

“By showing for the first time that water is produced in situ on the surface of an asteroid, our study builds on the accumulating body of evidence that the interaction of the solar wind with oxygen-rich dust grains does indeed produce water."

The team used a technique known as "atom probe tomography" to measure the atomic structure of the grains one atom at a time and detect individual water molecules.

Meteorites on their way to Earth breaking through the atmosphere. Water-carrying dust may have rained down on early Earth, alongside C-type asteroids, to create the planet's oceans. Photo: University of Glasgow
Meteorites on their way to Earth breaking through the atmosphere. Water-carrying dust may have rained down on early Earth, alongside C-type asteroids, to create the planet's oceans. Photo: University of Glasgow

Prof Michelle Thompson, another co-author, said these kinds of measurements would not have been possible without the technology.

“It gives us an extraordinary insight into how tiny dust particles floating in space might help us balance the books on the isotopic composition of the Earth’s water and give us new clues to help solve the mystery of its origins,” she said.

Water was previously discovered on the Itokawa asteroid but the process of space weathering gives newer insights into Earth's oceans.

Discovery could help future space missions

The team believes the findings suggest a way by which space explorers could secure a water source even on dry planets.

It is expensive to launch water into space and scientists are hopeful that future astronauts will be able to produce water supplies on site when exploring the Moon or other planets one day.

“One of the problems of future human space exploration is how astronauts will find enough water to keep them alive and accomplish their tasks without carrying it with them on their journey,” co-author Prof Hope Ishii said.

“We think it’s reasonable to assume that the same space-weathering process which created the water on Itokawa will have occurred to one degree or another on many airless worlds like the Moon or the asteroid Vesta.

“That could mean that space explorers may well be able to process fresh supplies of water straight from the dust on the planet’s surface. It’s exciting to think that the processes which formed the planets could help to support human life as we reach out beyond Earth.”

It’ll be summer in the city as car show tries to move with the times

If 2008 was the year that rocked Detroit, 2019 will be when Motor City gives its annual car extravaganza a revamp that aims to move with the times.

A major change is that this week's North American International Auto Show will be the last to be held in January, after which the event will switch to June.

The new date, organisers said, will allow exhibitors to move vehicles and activities outside the Cobo Center's halls and into other city venues, unencumbered by cold January weather, exemplified this week by snow and ice.

In a market in which trends can easily be outpaced beyond one event, the need to do so was probably exacerbated by the decision of Germany's big three carmakers – BMW, Mercedes-Benz and Audi – to skip the auto show this year.

The show has long allowed car enthusiasts to sit behind the wheel of the latest models at the start of the calendar year but a more fluid car market in an online world has made sales less seasonal.

Similarly, everyday technology seems to be catching up on those whose job it is to get behind microphones and try and tempt the visiting public into making a purchase.

Although sparkly announcers clasp iPads and outline the technical gadgetry hidden beneath bonnets, people's obsession with their own smartphones often appeared to offer a more tempting distraction.

“It's maddening,” said one such worker at Nissan's stand.

The absence of some pizzazz, as well as top marques, was also noted by patrons.

“It looks like there are a few less cars this year,” one annual attendee said of this year's exhibitors.

“I can't help but think it's easier to stay at home than to brave the snow and come here.”

From Zero

Artist: Linkin Park

Label: Warner Records

Number of tracks: 11

Rating: 4/5

Not Dark Yet

Shelby Lynne and Allison Moorer

Four stars

Simran

Director Hansal Mehta

Stars: Kangana Ranaut, Soham Shah, Esha Tiwari Pandey

Three stars

EPL's youngest
  • Ethan Nwaneri (Arsenal)
    15 years, 181 days old
  • Max Dowman (Arsenal)
    15 years, 235 days old
  • Jeremy Monga (Leicester)
    15 years, 271 days old
  • Harvey Elliott (Fulham)
    16 years, 30 days old
  • Matthew Briggs (Fulham)
    16 years, 68 days old
Fight card

Bantamweight

Siyovush Gulmamadov (TJK) v Rey Nacionales (PHI)

Lightweight

Alexandru Chitoran (ROM) v Hussein Fakhir Abed (SYR)

Catch 74kg

Tohir Zhuraev (TJK) v Omar Hussein (JOR)

Strawweight (Female)

Weronika Zygmunt (POL) v Seo Ye-dam (KOR)

Featherweight

Kaan Ofli (TUR) v Walid Laidi (ALG)

Lightweight

Leandro Martins (BRA) v Abdulla Al Bousheiri (KUW)

Welterweight

Ahmad Labban (LEB) v Sofiane Benchohra (ALG)

Bantamweight

Jaures Dea (CAM) v Nawras Abzakh (JOR)

Lightweight

Mohammed Yahya (UAE) v Glen Ranillo (PHI)

Lightweight

Alan Omer (GER) v Aidan Aguilera (AUS)

Welterweight

Mounir Lazzez (TUN) Sasha Palatnikov (HKG)

Featherweight title bout

Romando Dy (PHI) v Lee Do-gyeom (KOR)

TERMINAL HIGH ALTITUDE AREA DEFENCE (THAAD)

What is THAAD?

It is considered to be the US's most superior missile defence system.

Production:

It was created in 2008.

Speed:

THAAD missiles can travel at over Mach 8, so fast that it is hypersonic.

Abilities:

THAAD is designed to take out  ballistic missiles as they are on their downward trajectory towards their target, otherwise known as the "terminal phase".

Purpose:

To protect high-value strategic sites, such as airfields or population centres.

Range:

THAAD can target projectiles inside and outside the Earth's atmosphere, at an altitude of 150 kilometres above the Earth's surface.

Creators:

Lockheed Martin was originally granted the contract to develop the system in 1992. Defence company Raytheon sub-contracts to develop other major parts of the system, such as ground-based radar.

UAE and THAAD:

In 2011, the UAE became the first country outside of the US to buy two THAAD missile defence systems. It then stationed them in 2016, becoming the first Gulf country to do so.

FIGHT%20CARD
%3Cp%3EAnthony%20Joshua%20v%20Otto%20Wallin%2C%2012%20rounds%2C%20heavyweight%3C%2Fp%3E%0A%3Cp%3EDeontay%20Wilder%20v%20Joseph%20Parker%2C%2012%20rounds%2C%20heavyweight%3C%2Fp%3E%0A%3Cp%3EDmitry%20Bivol%20v%20Lyndon%20Arthur%2C%2012%20rounds%2C%20light%20heavyweight%3C%2Fp%3E%0A%3Cp%3EDaniel%20Dubois%20v%20Jarrell%20Miller%2C%2012%20rounds%2C%20heavyweight%3C%2Fp%3E%0A%3Cp%3EFilip%20Hrgovic%20v%20Mark%20de%20Mori%2C%2012%20rounds%2C%20heavyweight%C2%A0%3C%2Fp%3E%0A%3Cp%3EArslanbek%20Makhmudov%20v%20Agit%20Kabayel%2C%2012%20rounds%2C%20heavyweight%C2%A0%3C%2Fp%3E%0A%3Cp%3EFrank%20Sanchez%20v%20Junior%20Fa%2C%2012%20rounds%2C%20heavyweight%C2%A0%3C%2Fp%3E%0A%3Cp%3EJai%20Opetaia%20v%20Ellis%20Zorro%2C%2012%20rounds%2C%20cruiserweight%3C%2Fp%3E%0A
SPEC%20SHEET%3A%20APPLE%20IPAD%20PRO%20(12.9%22%2C%202022)
%3Cp%3E%3Cstrong%3EDisplay%3A%3C%2Fstrong%3E%2012.9-inch%20Liquid%20Retina%20XDR%2C%202%2C732%20x%202%2C048%2C%20264ppi%2C%20wide%20colour%2C%20True%20Tone%2C%20ProMotion%2C%201%2C600%20nits%20max%2C%20Apple%20Pencil%20hover%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EChip%3A%3C%2Fstrong%3E%20Apple%20M2%2C%208-core%20CPU%2C%2010-core%20GPU%2C%2016-core%20Neural%20Engine%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMemory%3A%3C%2Fstrong%3E%20Storage%20%E2%80%93%20128GB%2F256GB%2F512GB%20%2F%201TB%2F2TB%3B%20RAM%20%E2%80%93%208GB%2F16GB%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EPlatform%3A%3C%2Fstrong%3E%20iPadOS%2016%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMain%20camera%3A%3C%2Fstrong%3E%20Dual%2012MP%20wide%20(f%2F1.8)%20%2B%2010MP%20ultra-wide%20(f%2F2.4)%2C%202x%20optical%2F5x%20digital%2C%20Smart%20HDR%204%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EVideo%3A%3C%2Fstrong%3E%20ProRes%204K%20%40%2030fps%2C%204K%20%40%2024%2F25%2F30%2F60fps%2C%20full%20HD%20%40%2025%2F30%2F60fps%2C%20slo-mo%20%40%20120%2F240fps%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EFront%20camera%3A%3C%2Fstrong%3E%20TrueDepth%2012MP%20ultra-wide%20(f%2F2.4)%2C%202x%2C%20Smart%20HDR%204%2C%20Centre%20Stage%2C%20Portrait%2C%20Animoji%2C%20Memoji%3B%20full%20HD%20%40%2025%2F30%2F60fps%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EAudio%3A%3C%2Fstrong%3E%20Four-speaker%20stereo%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EBiometrics%3A%3C%2Fstrong%3E%20Face%20ID%2C%20Touch%20ID%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EI%2FO%3A%3C%2Fstrong%3E%20USB-C%2C%20smart%20connector%20(for%20folio%2Fkeyboard)%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EBattery%3A%3C%2Fstrong%3E%20Up%20to%2010%20hours%20on%20Wi-Fi%3B%20up%20to%20nine%20hours%20on%20cellular%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EFinish%3A%3C%2Fstrong%3E%20Silver%2C%20space%20grey%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EIn%20the%20box%3A%3C%2Fstrong%3E%20iPad%2C%20USB-C-to-USB-C%20cable%2C%2020-watt%20power%20adapter%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EPrice%3A%3C%2Fstrong%3E%20WiFi%20%E2%80%93%20Dh4%2C599%20(128GB)%20%2F%20Dh4%2C999%20(256GB)%20%2F%20Dh5%2C799%20(512GB)%20%2F%20Dh7%2C399%20(1TB)%20%2F%20Dh8%2C999%20(2TB)%3B%20cellular%20%E2%80%93%20Dh5%2C199%20%2F%20Dh5%2C599%20%2F%20Dh6%2C399%20%2F%20Dh7%2C999%20%2F%20Dh9%2C599%3C%2Fp%3E%0A
FIXTURES

UAE’s remaining fixtures in World Cup qualification R2
Oct 8: Malaysia (h)
Oct 13: Indonesia (a)
Nov 12: Thailand (h)
Nov 17: Vietnam (h)
 

AI traffic lights to ease congestion at seven points to Sheikh Zayed bin Sultan Street

The seven points are:

Shakhbout bin Sultan Street

Dhafeer Street

Hadbat Al Ghubainah Street (outbound)

Salama bint Butti Street

Al Dhafra Street

Rabdan Street

Umm Yifina Street exit (inbound)

The specs

Engine: 3.5-litre twin-turbo V6

Power: 380hp at 5,800rpm

Torque: 530Nm at 1,300-4,500rpm

Transmission: Eight-speed auto

Price: From Dh299,000 ($81,415)

On sale: Now

New UK refugee system

 

  • A new “core protection” for refugees moving from permanent to a more basic, temporary protection
  • Shortened leave to remain - refugees will receive 30 months instead of five years
  • A longer path to settlement with no indefinite settled status until a refugee has spent 20 years in Britain
  • To encourage refugees to integrate the government will encourage them to out of the core protection route wherever possible.
  • Under core protection there will be no automatic right to family reunion
  • Refugees will have a reduced right to public funds
Destroyer

Director: Karyn Kusama

Cast: Nicole Kidman, Toby Kebbell, Sebastian Stan

Rating: 3/5 

UAE release: January 31 

Temple numbers

Expected completion: 2022

Height: 24 meters

Ground floor banquet hall: 370 square metres to accommodate about 750 people

Ground floor multipurpose hall: 92 square metres for up to 200 people

First floor main Prayer Hall: 465 square metres to hold 1,500 people at a time

First floor terrace areas: 2,30 square metres  

Temple will be spread over 6,900 square metres

Structure includes two basements, ground and first floor 

Our family matters legal consultant

Name: Dr Hassan Mohsen Elhais

Position: legal consultant with Al Rowaad Advocates and Legal Consultants.

Benefits of first-time home buyers' scheme
  • Priority access to new homes from participating developers
  • Discounts on sales price of off-plan units
  • Flexible payment plans from developers
  • Mortgages with better interest rates, faster approval times and reduced fees
  • DLD registration fee can be paid through banks or credit cards at zero interest rates
Results:

5pm: Maiden (PA) Dh80,000 1,400m | Winner: Eghel De Pine, Pat Cosgrave (jockey), Eric Lemartinel (trainer)

5.30pm: Maiden (PA) Dh80,000 1,400m | Winner: AF Sheaar, Szczepan Mazur, Saeed Al Shamsi

6pm: Sheikh Zayed bin Sultan Al Nahyan National Day Cup (PA) Group 3 Dh500,000 1,600m | Winner: RB Torch, Fabrice Veron, Eric Lemartinel

6.30pm: Sheikh Zayed bin Sultan Al Nahyan National Day Cup (TB) Listed Dh380,000 1,600m | Winner: Forjatt, Chris Hayes, Nicholas Bachalard

7pm: Wathba Stallions Cup for Private Owners Handicap (PA) Dh 70,000 1,400m | Winner: Hawafez, Connor Beasley, Ridha ben Attia

7.30pm: Handicap (PA) Dh 80,000 1,600m | Winner: Qader, Richard Mullen, Jean de Roaulle

Groom and Two Brides

Director: Elie Semaan

Starring: Abdullah Boushehri, Laila Abdallah, Lulwa Almulla

Rating: 3/5

UAE currency: the story behind the money in your pockets
RESULTS

1.45pm: Maiden Dh75,000 1,400m
Winner: Dirilis Ertugrul, Fabrice Veron (jockey), Ismail Mohammed (trainer)
2.15pm: Handicap Dh90,000 1,400m
Winner: Kidd Malibu, Sandro Paiva, Musabah Al Muhairi
2.45pm: Maiden Dh75,000 1,000m
Winner: Raakezz, Tadhg O’Shea, Nicholas Bachalard
3.15pm: Handicap Dh105,000 1,200m
Winner: Au Couer, Sean Kirrane, Satish Seemar
3.45pm: Maiden Dh75,000 1,600m
Winner: Rayig, Pat Dobbs, Doug Watson
4.15pm: Handicap Dh105,000 1,600m
Winner: Chiefdom, Royston Ffrench, Salem bin Ghadayer
4.45pm: Handicap Dh80,000 1,800m
Winner: King’s Shadow, Richard Mullen, Satish Seemar

MATCH INFO

Champions League quarter-final, first leg

Ajax v Juventus, Wednesday, 11pm (UAE)

Match on BeIN Sports

SPEC%20SHEET%3A%20APPLE%20M3%20MACBOOK%20AIR%20(13%22)
%3Cp%3E%3Cstrong%3EProcessor%3A%3C%2Fstrong%3E%20Apple%20M3%2C%208-core%20CPU%2C%20up%20to%2010-core%20CPU%2C%2016-core%20Neural%20Engine%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EDisplay%3A%3C%2Fstrong%3E%2013.6-inch%20Liquid%20Retina%2C%202560%20x%201664%2C%20224ppi%2C%20500%20nits%2C%20True%20Tone%2C%20wide%20colour%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMemory%3A%3C%2Fstrong%3E%208%2F16%2F24GB%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStorage%3A%3C%2Fstrong%3E%20256%2F512GB%20%2F%201%2F2TB%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EI%2FO%3A%3C%2Fstrong%3E%20Thunderbolt%203%2FUSB-4%20(2)%2C%203.5mm%20audio%2C%20Touch%20ID%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EConnectivity%3A%3C%2Fstrong%3E%20Wi-Fi%206E%2C%20Bluetooth%205.3%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EBattery%3A%3C%2Fstrong%3E%2052.6Wh%20lithium-polymer%2C%20up%20to%2018%20hours%2C%20MagSafe%20charging%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ECamera%3A%3C%2Fstrong%3E%201080p%20FaceTime%20HD%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EVideo%3A%3C%2Fstrong%3E%20Support%20for%20Apple%20ProRes%2C%20HDR%20with%20Dolby%20Vision%2C%20HDR10%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EAudio%3A%3C%2Fstrong%3E%204-speaker%20system%2C%20wide%20stereo%2C%20support%20for%20Dolby%20Atmos%2C%20Spatial%20Audio%20and%20dynamic%20head%20tracking%20(with%20AirPods)%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EColours%3A%3C%2Fstrong%3E%20Midnight%2C%20silver%2C%20space%20grey%2C%20starlight%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EIn%20the%20box%3A%3C%2Fstrong%3E%20MacBook%20Air%2C%2030W%2F35W%20dual-port%2F70w%20power%20adapter%2C%20USB-C-to-MagSafe%20cable%2C%202%20Apple%20stickers%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EPrice%3A%3C%2Fstrong%3E%20From%20Dh4%2C599%3C%2Fp%3E%0A
Updated: November 30, 2021, 4:14 AM