If an astronaut on a deep space mission returned to Earth years later, only to find their loved ones had aged decades, it would sound like something out of a sci-fi blockbuster.
This is, in fact, one of the most memorable scenes from Interstellar, where an astronaut’s journey near a black hole causes him to age much slower than his family back home.
But this effect, known as time dilation, is not just science fiction. It is a real, measurable phenomenon described by Einstein’s theory of relativity.
While today’s missions do not reach speeds anywhere close to what would be needed to create significant time dilation, future high-speed space travel could bring this effect into play.
“If an astronaut were on a high-speed journey, they’d feel time passing normally on-board,” Jonathan Ward, an astronomer and author of several highly acclaimed space history books, told The National.
“But when they returned and compared their clock to one back on Earth, they’d see that much more time had passed on Earth. The effect of time dilation becomes stronger the faster you go.”
Understanding time dilation
He said that time dilation at its core means that time does not pass at the same rate for everyone, especially under extreme conditions of speed or gravity.
“When you travel close to the speed of light, you experience time very differently than people who stay behind,” said Mr Ward, a fellow of the UK’s Royal Astronomical Society.
“The closer you get to light speed, the slower time moves for you relative to Earth.”
The speed of light is the fastest speed in the universe, travelling at about 300,000km/sec, which means light could circle the Earth more than seven times in just one second.
To illustrate time dilation, Mr Ward described a hypothetical journey to Alpha Centauri, the closest star system to our solar system, 4.37 light years away.
He said that if an astronaut travelled at 1 per cent of the speed of light to the star system, the journey would take about 874 years from Earth’s perspective, and the astronaut would experience the vast majority of this, 873.98 years to be exact.
“But at 90 per cent of light speed, while nearly 10 years would pass for those on Earth, the astronaut would experience only about 4.24 years of travel,” he said.
“The closer you get to light speed, the more dramatic the time difference. If you were a photon, a particle of light, no time would pass for you at all, regardless of how far you travelled.”
Why time dilation is already a factor in space missions
Time dilation might seem far off for future space missions, but its effects are already impacting the technology we use in space today.
Sahith Reddy Madara, an aerospace engineer and founder of Paris advisory firm Bumi and Space, told The National that engineers must keep time dilation in mind when operating satellites around Earth and nearby planets.
“Engineers account for every minute relativity effects daily, especially with GPS satellites in low-Earth orbit,” he said.
GPS satellites orbit the planet at 28,163kph, so their on board clocks run slower than Earth's clocks by about seven microseconds a day due to their speed, and 45 microseconds due to Earth’s gravitational pull, according to Mr Ward.
“In deep space missions, these adjustments would scale up, potentially affecting mission timelines and data accuracy the farther out we go,” said Mr Madara.
He said that time dilation becomes crucial if interstellar travel becomes possible in future.
Higher speeds would mean greater differences in time flow between the spacecraft and Earth, which could impact communication, potentially creating problems when monitoring an astronaut’s health.
“Special systems would definitely be needed – possibly AI-based time-adaptive systems – to help bridge the communication gap created by these relativistic differences,” said Mr Madara.
“In terms of health data, time dilation could add a twist. Medical research already faces challenges comparing data between astronauts and Earth-based controls due to the space environment itself.
“If an astronaut’s ‘time’ flows slower, syncing health data would become more complex.
“We might have to adjust the data to account for their slower biological ageing relative to Earth’s time, potentially reshaping how we interpret long-term space mission health outcomes.”
Time dilation has also been observed in astronauts on the International Space Station, as seen in Nasa’s twin study with Mark and Scott Kelly.
The research demonstrated a tiny but measurable effect of time dilation. While Scott was on the station, travelling at 28,000 kph, time for him passed slightly slower than it did for Mark, who remained on Earth.
This difference, though extremely small, resulted in Scott ageing a few milliseconds less than Mark over the year he spent in orbit.
The time dilation effect is a consequence of both the station’s speed and its position in Earth’s gravitational field.
Could future missions unlock new physics?
Beyond navigation and practical concerns, time dilation offers scientists a valuable tool for unlocking new findings in physics.
Prof Matthew Griffin from the University of Cardiff told The National that time dilation helps explain certain high-speed particles that reach the Earth’s surface.
One example is cosmic muons, particles created high in Earth’s atmosphere with very short lifespans.
“Muons decay in a characteristic time that is very short. They are detected on the ground even though their lifetimes (in their own frame of reference) are too short for them to get to the ground before they decay,” he said.
“Distance-dependent time-dilation effects due to the varying expansion rate of the universe since the Big Bang are also seen in astronomical observations of very distant galaxies and supernovae.
“It has also been verified by comparing ultra-precise time measurements using atomic clocks that have been in orbit with clocks that have stayed on the ground.”
Red flags
- Promises of high, fixed or 'guaranteed' returns.
- Unregulated structured products or complex investments often used to bypass traditional safeguards.
- Lack of clear information, vague language, no access to audited financials.
- Overseas companies targeting investors in other jurisdictions - this can make legal recovery difficult.
- Hard-selling tactics - creating urgency, offering 'exclusive' deals.
Courtesy: Carol Glynn, founder of Conscious Finance Coaching
How to tell if your child is being bullied at school
Sudden change in behaviour or displays higher levels of stress or anxiety
Shows signs of depression or isolation
Ability to sleep well diminishes
Academic performance begins to deteriorate
Changes in eating habits
Struggles to concentrate
Refuses to go to school
Behaviour changes and is aggressive towards siblings
Begins to use language they do not normally use
From Zero
Artist: Linkin Park
Label: Warner Records
Number of tracks: 11
Rating: 4/5
Company%C2%A0profile
%3Cp%3E%3Cstrong%3ECompany%20name%3A%20%3C%2Fstrong%3EHayvn%3Cbr%3E%3Cstrong%3EStarted%3A%20%3C%2Fstrong%3E2018%3Cbr%3E%3Cstrong%3EFounders%3A%20%3C%2Fstrong%3EChristopher%20Flinos%2C%20Ahmed%20Ismail%3Cbr%3E%3Cstrong%3EBased%3A%20%3C%2Fstrong%3EAbu%20Dhabi%2C%20UAE%3Cbr%3E%3Cstrong%3ESector%3A%20%3C%2Fstrong%3Efinancial%3Cbr%3E%3Cstrong%3EInitial%20investment%3A%20%3C%2Fstrong%3Eundisclosed%3Cbr%3E%3Cstrong%3ESize%3A%3C%2Fstrong%3E%2044%20employees%3Cbr%3E%3Cstrong%3EInvestment%20stage%3A%20%3C%2Fstrong%3Eseries%20B%20in%20the%20second%20half%20of%202023%3Cbr%3E%3Cstrong%3EInvestors%3A%20%3C%2Fstrong%3EHilbert%20Capital%2C%20Red%20Acre%20Ventures%3C%2Fp%3E%0A
Killing of Qassem Suleimani
The%20specs
%3Cp%3E%3Cstrong%3EPowertrain%3A%20%3C%2Fstrong%3ESingle%20electric%20motor%0D%3Cbr%3E%3Cstrong%3EPower%3A%20%3C%2Fstrong%3E201hp%0D%3Cbr%3E%3Cstrong%3ETorque%3A%20%3C%2Fstrong%3E310Nm%0D%3Cbr%3E%3Cstrong%3ETransmission%3A%20%3C%2Fstrong%3ESingle-speed%20auto%0D%3Cbr%3E%3Cstrong%3EBattery%3A%20%3C%2Fstrong%3E53kWh%20lithium-ion%20battery%20pack%20(GS%20base%20model)%3B%2070kWh%20battery%20pack%20(GF)%0D%3Cbr%3E%3Cstrong%3ETouring%20range%3A%20%3C%2Fstrong%3E350km%20(GS)%3B%20480km%20(GF)%0D%3Cbr%3E%3Cstrong%3EPrice%3A%20%3C%2Fstrong%3EFrom%20Dh129%2C900%20(GS)%3B%20Dh149%2C000%20(GF)%0D%3Cbr%3E%3Cstrong%3EOn%20sale%3A%3C%2Fstrong%3E%20Now%3C%2Fp%3E%0A
The more serious side of specialty coffee
While the taste of beans and freshness of roast is paramount to the specialty coffee scene, so is sustainability and workers’ rights.
The bulk of genuine specialty coffee companies aim to improve on these elements in every stage of production via direct relationships with farmers. For instance, Mokha 1450 on Al Wasl Road strives to work predominantly with women-owned and -operated coffee organisations, including female farmers in the Sabree mountains of Yemen.
Because, as the boutique’s owner, Garfield Kerr, points out: “women represent over 90 per cent of the coffee value chain, but are woefully underrepresented in less than 10 per cent of ownership and management throughout the global coffee industry.”
One of the UAE’s largest suppliers of green (meaning not-yet-roasted) beans, Raw Coffee, is a founding member of the Partnership of Gender Equity, which aims to empower female coffee farmers and harvesters.
Also, globally, many companies have found the perfect way to recycle old coffee grounds: they create the perfect fertile soil in which to grow mushrooms.
Lexus LX700h specs
Engine: 3.4-litre twin-turbo V6 plus supplementary electric motor
Power: 464hp at 5,200rpm
Torque: 790Nm from 2,000-3,600rpm
Transmission: 10-speed auto
Fuel consumption: 11.7L/100km
On sale: Now
Price: From Dh590,000
FIXTURES
All times UAE ( 4 GMT)
Friday
Saint-Etienne v Montpellier (10.45pm)
Saturday
Monaco v Caen (7pm)
Amiens v Bordeaux (10pm)
Angers v Toulouse (10pm)
Metz v Dijon (10pm)
Nantes v Guingamp (10pm)
Rennes v Lille (10pm)
Sunday
Nice v Strasbourg (5pm)
Troyes v Lyon (7pm)
Marseille v Paris Saint-Germain (11pm)
The White Lotus: Season three
Creator: Mike White
Starring: Walton Goggins, Jason Isaacs, Natasha Rothwell
Rating: 4.5/5
%3Cp%3E%3Ca%20href%3D%22https%3A%2F%2Fwww.thenationalnews.com%2Fbusiness%2Feconomy%2Fislamic-economy-consumer-spending-to-increase-45-to-3-2tn-by-2024-1.936583%22%20target%3D%22_self%22%3EGlobal%20Islamic%20economy%20to%20grow%203.1%25%20to%20touch%20%242.4%20trillion%20by%202024%3C%2Fa%3E%26nbsp%3B%3C%2Fp%3E%0A%3Cp%3E%3Ca%20href%3D%22https%3A%2F%2Fwww.thenationalnews.com%2Fbusiness%2Feconomy%2Fuk-economy-plunges-into-worst-ever-recession-after-record-20-4-contraction-1.1062560%22%20target%3D%22_self%22%3EUK%20economy%20plunges%20into%20worst-ever%20recession%20after%20record%2020.4%25%20contraction%3C%2Fa%3E%3C%2Fp%3E%0A%3Cp%3E%3Ca%20href%3D%22https%3A%2F%2Fwww.thenationalnews.com%2Fbusiness%2Feconomy%2Fislamic-economy-consumer-spending-to-increase-45-to-3-2tn-by-2024-1.936583%22%20target%3D%22_self%22%3EIslamic%20economy%20consumer%20spending%20to%20increase%2045%25%20to%20%243.2tn%20by%202024%3C%2Fa%3E%3C%2Fp%3E%0A
OIL PLEDGE
At the start of Russia's invasion, IEA member countries held 1.5 billion barrels in public reserves and about 575 million barrels under obligations with industry, according to the agency's website. The two collective actions of the IEA this year of 62.7 million barrels, which was agreed on March 1, and this week's 120 million barrels amount to 9 per cent of total emergency reserves, it added.
Killing of Qassem Suleimani
Read more about the coronavirus
How to get there
Emirates (www.emirates.com) flies directly to Hanoi, Vietnam, with fares starting from around Dh2,725 return, while Etihad (www.etihad.com) fares cost about Dh2,213 return with a stop. Chuong is 25 kilometres south of Hanoi.
The specs
Engine: 3.5-litre V6
Power: 272hp at 6,400rpm
Torque: 331Nm from 5,000rpm
Transmission: 8-speed auto
Fuel consumption: 9.7L/100km
On sale: now
Price: Dh149,000
Gender pay parity on track in the UAE
The UAE has a good record on gender pay parity, according to Mercer's Total Remuneration Study.
"In some of the lower levels of jobs women tend to be paid more than men, primarily because men are employed in blue collar jobs and women tend to be employed in white collar jobs which pay better," said Ted Raffoul, career products leader, Mena at Mercer. "I am yet to see a company in the UAE – particularly when you are looking at a blue chip multinationals or some of the bigger local companies – that actively discriminates when it comes to gender on pay."
Mr Raffoul said most gender issues are actually due to the cultural class, as the population is dominated by Asian and Arab cultures where men are generally expected to work and earn whereas women are meant to start a family.
"For that reason, we see a different gender gap. There are less women in senior roles because women tend to focus less on this but that’s not due to any companies having a policy penalising women for any reasons – it’s a cultural thing," he said.
As a result, Mr Raffoul said many companies in the UAE are coming up with benefit package programmes to help working mothers and the career development of women in general.
360Vuz PROFILE
Date started: January 2017
Founder: Khaled Zaatarah
Based: Dubai and Los Angeles
Sector: Technology
Size: 21 employees
Funding: $7 million
Investors: Shorooq Partners, KBW Ventures, Vision Ventures, Hala Ventures, 500Startups, Plug and Play, Magnus Olsson, Samih Toukan, Jonathan Labin
UAE currency: the story behind the money in your pockets
Know before you go
- Jebel Akhdar is a two-hour drive from Muscat airport or a six-hour drive from Dubai. It’s impossible to visit by car unless you have a 4x4. Phone ahead to the hotel to arrange a transfer.
- If you’re driving, make sure your insurance covers Oman.
- By air: Budget airlines Air Arabia, Flydubai and SalamAir offer direct routes to Muscat from the UAE.
- Tourists from the Emirates (UAE nationals not included) must apply for an Omani visa online before arrival at evisa.rop.gov.om. The process typically takes several days.
- Flash floods are probable due to the terrain and a lack of drainage. Always check the weather before venturing into any canyons or other remote areas and identify a plan of escape that includes high ground, shelter and parking where your car won’t be overtaken by sudden downpours.
UAE currency: the story behind the money in your pockets
Killing of Qassem Suleimani
UAE currency: the story behind the money in your pockets
Innotech Profile
Date started: 2013
Founder/CEO: Othman Al Mandhari
Based: Muscat, Oman
Sector: Additive manufacturing, 3D printing technologies
Size: 15 full-time employees
Stage: Seed stage and seeking Series A round of financing
Investors: Oman Technology Fund from 2017 to 2019, exited through an agreement with a new investor to secure new funding that it under negotiation right now.
Ferrari 12Cilindri specs
Engine: naturally aspirated 6.5-liter V12
Power: 819hp
Torque: 678Nm at 7,250rpm
Price: From Dh1,700,000
Available: Now
Winners
Best Men's Player of the Year: Kylian Mbappe (PSG)
Maradona Award for Best Goal Scorer of the Year: Robert Lewandowski (Bayern Munich)
TikTok Fans’ Player of the Year: Robert Lewandowski
Top Goal Scorer of All Time: Cristiano Ronaldo (Manchester United)
Best Women's Player of the Year: Alexia Putellas (Barcelona)
Best Men's Club of the Year: Chelsea
Best Women's Club of the Year: Barcelona
Best Defender of the Year: Leonardo Bonucci (Juventus/Italy)
Best Goalkeeper of the Year: Gianluigi Donnarumma (PSG/Italy)
Best Coach of the Year: Roberto Mancini (Italy)
Best National Team of the Year: Italy
Best Agent of the Year: Federico Pastorello
Best Sporting Director of the Year: Txiki Begiristain (Manchester City)
Player Career Award: Ronaldinho
57%20Seconds
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Rusty%20Cundieff%0D%3Cbr%3E%3Cstrong%3EStars%3A%20%3C%2Fstrong%3EJosh%20Hutcherson%2C%20Morgan%20Freeman%2C%20Greg%20Germann%2C%20Lovie%20Simone%0D%3Cbr%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E2%2F5%0D%3Cbr%3E%0D%3Cbr%3E%3C%2Fp%3E%0A
Emergency
Director: Kangana Ranaut
Stars: Kangana Ranaut, Anupam Kher, Shreyas Talpade, Milind Soman, Mahima Chaudhry
Rating: 2/5
Mohammed bin Zayed Majlis
UAE%20medallists%20at%20Asian%20Games%202023
%3Cp%3E%3Cstrong%3EGold%3C%2Fstrong%3E%0D%3Cbr%3EMagomedomar%20Magomedomarov%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20%2B100kg%0D%3Cbr%3EKhaled%20Al%20Shehi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-62kg%0D%3Cbr%3EFaisal%20Al%20Ketbi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-85kg%0D%3Cbr%3EAsma%20Al%20Hosani%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-52kg%0D%3Cbr%3EShamma%20Al%20Kalbani%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-63kg%0D%3Cbr%3E%3Cstrong%3ESilver%3C%2Fstrong%3E%0D%3Cbr%3EOmar%20Al%20Marzooqi%20%E2%80%93%20Equestrian%20%E2%80%93%20Individual%20showjumping%0D%3Cbr%3EBishrelt%20Khorloodoi%20%E2%80%93%20Judo%20%E2%80%93%20Women%E2%80%99s%20-52kg%0D%3Cbr%3EKhalid%20Al%20Blooshi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-62kg%0D%3Cbr%3EMohamed%20Al%20Suwaidi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-69kg%0D%3Cbr%3EBalqees%20Abdulla%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-48kg%0D%3Cbr%3E%3Cstrong%3EBronze%3C%2Fstrong%3E%0D%3Cbr%3EHawraa%20Alajmi%20%E2%80%93%20Karate%20%E2%80%93%20Women%E2%80%99s%20kumite%20-50kg%0D%3Cbr%3EAhmed%20Al%20Mansoori%20%E2%80%93%20Cycling%20%E2%80%93%20Men%E2%80%99s%20omnium%0D%3Cbr%3EAbdullah%20Al%20Marri%20%E2%80%93%20Equestrian%20%E2%80%93%20Individual%20showjumping%0D%3Cbr%3ETeam%20UAE%20%E2%80%93%20Equestrian%20%E2%80%93%20Team%20showjumping%0D%3Cbr%3EDzhafar%20Kostoev%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-100kg%0D%3Cbr%3ENarmandakh%20Bayanmunkh%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-66kg%0D%3Cbr%3EGrigorian%20Aram%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-90kg%0D%3Cbr%3EMahdi%20Al%20Awlaqi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-77kg%0D%3Cbr%3ESaeed%20Al%20Kubaisi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-85kg%0D%3Cbr%3EShamsa%20Al%20Ameri%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-57kg%0D%3C%2Fp%3E%0A
More from Neighbourhood Watch:
How to protect yourself when air quality drops
Install an air filter in your home.
Close your windows and turn on the AC.
Shower or bath after being outside.
Wear a face mask.
Stay indoors when conditions are particularly poor.
If driving, turn your engine off when stationary.
Specs
Engine: 51.5kW electric motor
Range: 400km
Power: 134bhp
Torque: 175Nm
Price: From Dh98,800
Available: Now
Mica
Director: Ismael Ferroukhi
Stars: Zakaria Inan, Sabrina Ouazani
3 stars
Killing of Qassem Suleimani
What to watch out for:
Algae, waste coffee grounds and orange peels will be used in the pavilion's walls and gangways
The hulls of three ships will be used for the roof
The hulls will painted to make the largest Italian tricolour in the country’s history
Several pillars more than 20 metres high will support the structure
Roughly 15 tonnes of steel will be used
