Mars may be too small to hold on to large amounts of water, a new study suggests.
While water is essential for life on Earth and other planets, and scientists have found evidence of water in Mars’ early history, the red planet has no liquid water on its surface today.
Researchers have suggested there could be a number of explanations of why there is no longer any water on Mars, including a weakening of its magnetic field that could have resulted in the thinning of its atmosphere.
But the new study offers a more fundamental reason why today’s Mars looks so drastically different to Earth.
Kun Wang is assistant professor of earth and planetary sciences at Washington University and was a senior author of the study.
“Mars’s fate was decided from the beginning,” he said.
“There is likely a threshold on the size requirements of rocky planets to retain enough water to enable habitability and plate tectonics, with mass exceeding that of Mars.”
For the new study, the researchers used stable isotopes of the element potassium to estimate the presence, distribution and abundance of volatile elements on different planetary bodies.
Researchers measured the compositions of 20 previously confirmed Martian meteorites, selected to be representative of the bulk silicate composition of the red planet.
They found that Mars lost more potassium and other volatiles than Earth during its formation, but retained more of these volatiles than the Moon and asteroid 4-Vesta – two much smaller and drier bodies than Earth and Mars.
According to the study, there was a well-defined correlation between body size and potassium isotopic composition.
Katharina Lodders, research professor of earth and planetary sciences at Washington University, and a co-author of the study, said: “The finding of the correlation of K [potassium] isotopic compositions with planet gravity is a novel discovery with important quantitative implications for when and how the differentiated planets received and lost their volatiles.”
Prof Wang said: “Martian meteorites are the only samples available to us to study the chemical make-up of the bulk [composition of] Mars.
“Those Martian meteorites have ages varying from several hundred millions to four billion years and recorded Mars’s volatile evolution history.
“It’s indisputable that there used to be liquid water on the surface of Mars, but how much water in total Mars once had is hard to quantify through remote sensing and rover studies alone.
“There are many models out there for the bulk water content of Mars.
“In some of them, early Mars was even wetter than the Earth. We don’t believe that was the case.”
The researchers say their findings have implications for the search for life on other planets.
Being too close to the Sun (or, for exoplanets, being too close to their star) can affect the amount of volatiles that a planetary body can retain.
This distance-from-star measurement is often factored into indexes of habitable zones around stars.
Klaus Mezger is professor of geochemistry at the Centre for Space and Habitability at the University of Bern, Switzerland and a co-author of the study.
“This study emphasises that there is a very limited size range for planets to have just enough but not too much water to develop a habitable surface environment,” he said.
“These results will guide astronomers in their search for habitable exoplanets in other solar systems.”
Prof Wang now thinks that for planets that are within habitable zones, more emphasis should be placed on planetary size and this should routinely be considered when thinking about whether an exoplanet could support life.
“The size of an exoplanet is one of the parameters that is easiest to determine,” he said.
“Based on size and mass, we now know whether an exoplanet is a candidate for life, because a first-order determining factor for volatile retention is size.”
The specs
Engine: 2.0-litre 4cyl turbo
Power: 261hp at 5,500rpm
Torque: 405Nm at 1,750-3,500rpm
Transmission: 9-speed auto
Fuel consumption: 6.9L/100km
On sale: Now
Price: From Dh117,059
Labour dispute
The insured employee may still file an ILOE claim even if a labour dispute is ongoing post termination, but the insurer may suspend or reject payment, until the courts resolve the dispute, especially if the reason for termination is contested. The outcome of the labour court proceedings can directly affect eligibility.
- Abdullah Ishnaneh, Partner, BSA Law
Killing of Qassem Suleimani
MATCH INFO
Uefa Champions League semi-finals, second leg:
Liverpool (0) v Barcelona (3), Tuesday, 11pm UAE
Game is on BeIN Sports
The bio
Who inspires you?
I am in awe of the remarkable women in the Arab region, both big and small, pushing boundaries and becoming role models for generations. Emily Nasrallah was a writer, journalist, teacher and women’s rights activist
How do you relax?
Yoga relaxes me and helps me relieve tension, especially now when we’re practically chained to laptops and desks. I enjoy learning more about music and the history of famous music bands and genres.
What is favourite book?
The Perks of Being a Wallflower - I think I've read it more than 7 times
What is your favourite Arabic film?
Hala2 Lawen (Translation: Where Do We Go Now?) by Nadine Labaki
What is favourite English film?
Mamma Mia
Best piece of advice to someone looking for a career at Google?
If you’re interested in a career at Google, deep dive into the different career paths and pinpoint the space you want to join. When you know your space, you’re likely to identify the skills you need to develop.
UAE players with central contracts
Rohan Mustafa, Ashfaq Ahmed, Chirag Suri, Rameez Shahzad, Shaiman Anwar, Adnan Mufti, Mohammed Usman, Ghulam Shabbir, Ahmed Raza, Qadeer Ahmed, Amir Hayat, Mohammed Naveed and Imran Haider.
Company%20profile
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Mina Cup winners
Under 12 – Minerva Academy
Under 14 – Unam Pumas
Under 16 – Fursan Hispania
Under 18 – Madenat
The specs: 2018 Nissan Patrol Nismo
Price: base / as tested: Dh382,000
Engine: 5.6-litre V8
Gearbox: Seven-speed automatic
Power: 428hp @ 5,800rpm
Torque: 560Nm @ 3,600rpm
Fuel economy, combined: 12.7L / 100km
Company%20profile
%3Cp%3E%3Cstrong%3EName%3A%3C%2Fstrong%3E%20JustClean%3Cbr%3E%3Cbr%3E%3Cstrong%3EBased%3A%20%3C%2Fstrong%3EDubai%20with%20offices%20in%20other%20GCC%20countries%3Cbr%3E%3Cbr%3E%3Cstrong%3ELaunch%20year%3A%3C%2Fstrong%3E%202016%3Cbr%3E%3Cbr%3E%3Cstrong%3ENumber%20of%20employees%3A%3C%2Fstrong%3E%20160%2B%20with%2021%20nationalities%20in%20eight%20cities%3Cbr%3E%3Cstrong%3E%3Cbr%3ESector%3A%3C%2Fstrong%3E%20online%20laundry%20and%20cleaning%20services%3Cbr%3E%3Cbr%3E%3Cstrong%3EFunding%3A%20%3C%2Fstrong%3E%2430m%20from%20Kuwait-based%20Faith%20Capital%20Holding%20and%20Gulf%20Investment%20Corporation%3C%2Fp%3E%0A
Racecard
6.30pm: Mazrat Al Ruwayah Group Two (PA) US$55,000 (Dirt) 1,600m
7.05pm: Meydan Trophy (TB) $100,000 (Turf) 1,900m
7.40pm: Handicap (TB) $135,000 (D) 1,200m
8.15pm: Balanchine Group Two (TB) $250,000 (T) 1,800m
8.50pm: Handicap (TB) $135,000 (T) 1,000m
9.25pm: Firebreak Stakes Group Three (TB) $200,000 (D) 1,600m
10pm: Handicap (TB) $175,000 (T) 2,410m
The National selections: 6.30pm: RM Lam Tara, 7.05pm: Al Mukhtar Star, 7.40pm: Bochart, 8.15pm: Magic Lily, 8.50pm: Roulston Scar, 9.25pm: Quip, 10pm: Jalmoud
MATCH INFO
Mainz 0
RB Leipzig 5 (Werner 11', 48', 75', Poulsen 23', Sabitzer 36')
Man of the Match: Timo Werner (RB Leipzig)
2020 Oscars winners: in numbers
- Parasite – 4
- 1917– 3
- Ford v Ferrari – 2
- Joker – 2
- Once Upon a Time ... in Hollywood – 2
- American Factory – 1
- Bombshell – 1
- Hair Love – 1
- Jojo Rabbit – 1
- Judy – 1
- Little Women – 1
- Learning to Skateboard in a Warzone (If You're a Girl) – 1
- Marriage Story – 1
- Rocketman – 1
- The Neighbors' Window – 1
- Toy Story 4 – 1
Infiniti QX80 specs
Engine: twin-turbocharged 3.5-liter V6
Power: 450hp
Torque: 700Nm
Price: From Dh450,000, Autograph model from Dh510,000
Available: Now
The biog
Age: 59
From: Giza Governorate, Egypt
Family: A daughter, two sons and wife
Favourite tree: Ghaf
Runner up favourite tree: Frankincense
Favourite place on Sir Bani Yas Island: “I love all of Sir Bani Yas. Every spot of Sir Bani Yas, I love it.”
Seemar’s top six for the Dubai World Cup Carnival:
1. Reynaldothewizard
2. North America
3. Raven’s Corner
4. Hawkesbury
5. New Maharajah
6. Secret Ambition
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 burning issue
The internal combustion engine is facing a watershed moment – major manufacturer Volvo is to stop producing petroleum-powered vehicles by 2021 and countries in Europe, including the UK, have vowed to ban their sale before 2040. The National takes a look at the story of one of the most successful technologies of the last 100 years and how it has impacted life in the UAE.
Read part four: an affection for classic cars lives on
Read part three: the age of the electric vehicle begins
Read part one: how cars came to the UAE
Key findings of Jenkins report
- Founder of the Muslim Brotherhood, Hassan al Banna, "accepted the political utility of violence"
- Views of key Muslim Brotherhood ideologue, Sayyid Qutb, have “consistently been understood” as permitting “the use of extreme violence in the pursuit of the perfect Islamic society” and “never been institutionally disowned” by the movement.
- Muslim Brotherhood at all levels has repeatedly defended Hamas attacks against Israel, including the use of suicide bombers and the killing of civilians.
- Laying out the report in the House of Commons, David Cameron told MPs: "The main findings of the review support the conclusion that membership of, association with, or influence by the Muslim Brotherhood should be considered as a possible indicator of extremism."
Pharaoh's curse
British aristocrat Lord Carnarvon, who funded the expedition to find the Tutankhamun tomb, died in a Cairo hotel four months after the crypt was opened.
He had been in poor health for many years after a car crash, and a mosquito bite made worse by a shaving cut led to blood poisoning and pneumonia.
Reports at the time said Lord Carnarvon suffered from “pain as the inflammation affected the nasal passages and eyes”.
Decades later, scientists contended he had died of aspergillosis after inhaling spores of the fungus aspergillus in the tomb, which can lie dormant for months. The fact several others who entered were also found dead withiin a short time led to the myth of the curse.
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
Getting%20there%20and%20where%20to%20stay
%3Cp%3EFly%20with%20Etihad%20Airways%20from%20Abu%20Dhabi%20to%20New%20York%E2%80%99s%20JFK.%20There's%2011%20flights%20a%20week%20and%20economy%20fares%20start%20at%20around%20Dh5%2C000.%3Cbr%3EStay%20at%20The%20Mark%20Hotel%20on%20the%20city%E2%80%99s%20Upper%20East%20Side.%20Overnight%20stays%20start%20from%20%241395%20per%20night.%3Cbr%3EVisit%20NYC%20Go%2C%20the%20official%20destination%20resource%20for%20New%20York%20City%20for%20all%20the%20latest%20events%2C%20activites%20and%20openings.%3Cbr%3E%3C%2Fp%3E%0A
Specs
Engine: Electric motor generating 54.2kWh (Cooper SE and Aceman SE), 64.6kW (Countryman All4 SE)
Power: 218hp (Cooper and Aceman), 313hp (Countryman)
Torque: 330Nm (Cooper and Aceman), 494Nm (Countryman)
On sale: Now
Price: From Dh158,000 (Cooper), Dh168,000 (Aceman), Dh190,000 (Countryman)
The specs
Engine: 4.0-litre flat-six
Torque: 450Nm at 6,100rpm
Transmission: 7-speed PDK auto or 6-speed manual
Fuel economy, combined: 13.8L/100km
On sale: Available to order now
Key facilities
- Olympic-size swimming pool with a split bulkhead for multi-use configurations, including water polo and 50m/25m training lanes
- Premier League-standard football pitch
- 400m Olympic running track
- NBA-spec basketball court with auditorium
- 600-seat auditorium
- Spaces for historical and cultural exploration
- An elevated football field that doubles as a helipad
- Specialist robotics and science laboratories
- AR and VR-enabled learning centres
- Disruption Lab and Research Centre for developing entrepreneurial skills
Living in...
This article is part of a guide on where to live in the UAE. Our reporters will profile some of the country’s most desirable districts, provide an estimate of rental prices and introduce you to some of the residents who call each area home.
COMPANY%20PROFILE
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How to watch Ireland v Pakistan in UAE
When: The one-off Test starts on Friday, May 11
What time: Each day’s play is scheduled to start at 2pm UAE time.
TV: The match will be broadcast on OSN Sports Cricket HD. Subscribers to the channel can also stream the action live on OSN Play.
DC%20League%20of%20Super-Pets
%3Cp%3EDirector%3A%20Jared%20Stern%3C%2Fp%3E%0A%3Cp%3EStarring%3A%20Dwayne%20Johnson%2C%20Kevin%20Hart%2C%20John%20Krasinski%2C%20Keanu%20Reeves%2C%20Olivia%20Wilde%2C%20Kate%20McKinnon%2C%20Jameela%20Jamil%3C%2Fp%3E%0A%3Cp%3ERating%3A%203%2F5%3C%2Fp%3E%0A
Tank warfare
Lt Gen Erik Petersen, deputy chief of programs, US Army, has argued it took a “three decade holiday” on modernising tanks.
“There clearly remains a significant armoured heavy ground manoeuvre threat in this world and maintaining a world class armoured force is absolutely vital,” the general said in London last week.
“We are developing next generation capabilities to compete with and deter adversaries to prevent opportunism or miscalculation, and, if necessary, defeat any foe decisively.”
UAE currency: the story behind the money in your pockets
UAE currency: the story behind the money in your pockets
Squid Game season two
Director: Hwang Dong-hyuk
Stars: Lee Jung-jae, Wi Ha-joon and Lee Byung-hun
Rating: 4.5/5
The drill
Recharge as needed, says Mat Dryden: “We try to make it a rule that every two to three months, even if it’s for four days, we get away, get some time together, recharge, refresh.” The couple take an hour a day to check into their businesses and that’s it.
Stick to the schedule, says Mike Addo: “We have an entire wall known as ‘The Lab,’ covered with colour-coded Post-it notes dedicated to our joint weekly planner, content board, marketing strategy, trends, ideas and upcoming meetings.”
Be a team, suggests Addo: “When training together, you have to trust in each other’s abilities. Otherwise working out together very quickly becomes one person training the other.”
Pull your weight, says Thuymi Do: “To do what we do, there definitely can be no lazy member of the team.”
BIGGEST CYBER SECURITY INCIDENTS IN RECENT TIMES
SolarWinds supply chain attack: Came to light in December 2020 but had taken root for several months, compromising major tech companies, governments and its entities
Microsoft Exchange server exploitation: March 2021; attackers used a vulnerability to steal emails
Kaseya attack: July 2021; ransomware hit perpetrated REvil, resulting in severe downtime for more than 1,000 companies
Log4j breach: December 2021; attackers exploited the Java-written code to inflitrate businesses and governments
