Scientists have solved the mystery of why some of the universe’s oldest massive galaxies go quiet early in their formation.
These galaxies, which formed in the 3 billion years after the Big Bang, should have contained large amounts of cold hydrogen gas, the fuel required to make stars.
But researchers observing the early universe with the Atacama Large Millimetre/Submillimetre Array, known as Alma, and the Hubble Space Telescope have found half a dozen early huge galaxies that ran out of fuel.
“The most massive galaxies in the universe lived fast and furious, creating their stars in a remarkably short amount of time," said Kate Whitaker, professor of astronomy at the University of Massachusetts Amherst, in the US.
“Gas, the fuel of star formation, should be plentiful at these early times in the universe. We originally believed that these quenched galaxies hit the brakes just a few billion years after the Big Bang.
“In our new research, we’ve concluded that early galaxies didn’t actually put the brakes on, but rather they were running on empty.”
Star formation is a key way in which galaxies grow, and they are said to have become inactive when they stop forming stars.
“There was copious cold gas in the early universe, so these galaxies, from 12 billion years ago, should have plenty left in the fuel tank,” Prof Whitaker said.
Instead, researchers found only traces of cold gas at the centre of each galaxy.
This suggests that within the first few billion years of the universe’s existence, these galaxies either burnt through their energy supplies or ejected them.
It further indicates something may be physically blocking each galaxy’s replenishment of cold gas, researchers suggest.
They are not sure why this happens but possible explanations could be that the primary gas supply fuelling the galaxy is cut off, or perhaps a supermassive black hole is injecting energy that keeps the gas in the galaxy hot.
The galaxies are so far away that we are only just now seeing the light they emitted 10 billion to 12 billion years ago, when the universe was in its infancy.
The findings are published in Nature.
More from Rashmee Roshan Lall
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
Frida%20
%3Cp%3E%3Cstrong%3EDirector%3A%20%3C%2Fstrong%3ECarla%20Gutierrez%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarring%3A%3C%2Fstrong%3E%20Frida%20Kahlo%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%204%2F5%3C%2Fp%3E%0A
The%20Woman%20King%20
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Gina%20Prince-Bythewood%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStars%3A%3C%2Fstrong%3E%20Viola%20Davis%2C%20Thuso%20Mbedu%2C%20Sheila%20Atim%2C%20Lashana%20Lynch%2C%20John%20Boyega%C2%A0%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%203%2F5%3C%2Fp%3E%0A
ELIO
Starring: Yonas Kibreab, Zoe Saldana, Brad Garrett
Directors: Madeline Sharafian, Domee Shi, Adrian Molina
Rating: 4/5
PAKISTAN SQUAD
Abid Ali, Fakhar Zaman, Imam-ul-Haq, Shan Masood, Azhar Ali (test captain), Babar Azam (T20 captain), Asad Shafiq, Fawad Alam, Haider Ali, Iftikhar Ahmad, Khushdil Shah, Mohammad Hafeez, Shoaib Malik, Mohammad Rizwan (wicketkeeper), Sarfaraz Ahmed (wicketkeeper), Faheem Ashraf, Haris Rauf, Imran Khan, Mohammad Abbas, Mohammad Hasnain, Naseem Shah, Shaheen Afridi, Sohail Khan, Usman Shinwari, Wahab Riaz, Imad Wasim, Kashif Bhatti, Shadab Khan and Yasir Shah.
The Greatest Royal Rumble card as it stands
50-man Royal Rumble
Universal Championship Brock Lesnar (champion) v Roman Reigns in a steel cage match
Intercontinental Championship Seth Rollins (champion) v The Miz v Finn Balor v Samoa Joe
SmackDown Tag Team Championship The Bludgeon Brothers (champions) v The Usos
Casket match The Undertaker v Chris Jericho
John Cena v Triple H
Matches to be announced
WWE World Heavyweight Championship, Raw Tag Team Championship, United States Championship and the Cruiserweight Championship are all due to be defended
UAE currency: the story behind the money in your pockets
Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.
The biog
Mission to Seafarers is one of the largest port-based welfare operators in the world.
It provided services to around 200 ports across 50 countries.
They also provide port chaplains to help them deliver professional welfare services.
Dubai Rugby Sevens
November 30-December 2, at The Sevens, Dubai
Gulf Under 19
Pool A – Abu Dhabi Harlequins, Jumeirah College Tigers, Dubai English Speaking School 1, Gems World Academy
Pool B – British School Al Khubairat, Bahrain Colts, Jumeirah College Lions, Dubai English Speaking School 2
Pool C - Dubai College A, Dubai Sharks, Jumeirah English Speaking School, Al Yasmina
Pool D – Dubai Exiles, Dubai Hurricanes, Al Ain Amblers, Deira International School
Our legal columnist
Name: Yousef Al Bahar
Advocate at Al Bahar & Associate Advocates and Legal Consultants, established in 1994
Education: Mr Al Bahar was born in 1979 and graduated in 2008 from the Judicial Institute. He took after his father, who was one of the first Emirati lawyers
Result
Arsenal 4
Monreal (51'), Ramsey (82'), Lacazette 85', 89')
West Ham United 1
Arnautovic (64')
FIXTURES
All games 6pm UAE on Sunday:
Arsenal v Watford
Burnley v Brighton
Chelsea v Wolves
Crystal Palace v Tottenham
Everton v Bournemouth
Leicester v Man United
Man City v Norwich
Newcastle v Liverpool
Southampton v Sheffield United
West Ham v Aston Villa
The specs: 2018 Volkswagen Teramont
Price, base / as tested Dh137,000 / Dh189,950
Engine 3.6-litre V6
Gearbox Eight-speed automatic
Power 280hp @ 6,200rpm
Torque 360Nm @ 2,750rpm
Fuel economy, combined 11.7L / 100km
The specs: 2019 Haval H6
Price, base: Dh69,900
Engine: 2.0-litre turbocharged four-cylinder
Transmission: Seven-speed automatic
Power: 197hp @ 5,500rpm
Torque: 315Nm @ 2,000rpm
Fuel economy, combined: 7.0L / 100km
Ferrari 12Cilindri specs
Engine: naturally aspirated 6.5-liter V12
Power: 819hp
Torque: 678Nm at 7,250rpm
Price: From Dh1,700,000
Available: Now
CHINESE GRAND PRIX STARTING GRID
1st row
Sebastian Vettel (Ferrari)
Kimi Raikkonen (Ferrari)
2nd row
Valtteri Bottas (Mercedes-GP)
Lewis Hamilton (Mercedes-GP)
3rd row
Max Verstappen (Red Bull Racing)
Daniel Ricciardo (Red Bull Racing)
4th row
Nico Hulkenberg (Renault)
Sergio Perez (Force India)
5th row
Carlos Sainz Jr (Renault)
Romain Grosjean (Haas)
6th row
Kevin Magnussen (Haas)
Esteban Ocon (Force India)
7th row
Fernando Alonso (McLaren)
Stoffel Vandoorne (McLaren)
8th row
Brendon Hartley (Toro Rosso)
Sergey Sirotkin (Williams)
9th row
Pierre Gasly (Toro Rosso)
Lance Stroll (Williams)
10th row
Charles Leclerc (Sauber)
arcus Ericsson (Sauber)
match info
Southampton 2 (Ings 32' & pen 89') Tottenham Hotspur 5 (Son 45', 47', 64', & 73', Kane 82')
Man of the match Son Heung-min (Tottenham)
Global state-owned investor ranking by size
|
1.
|
United States
|
|
2.
|
China
|
|
3.
|
UAE
|
|
4.
|
Japan
|
|
5
|
Norway
|
|
6.
|
Canada
|
|
7.
|
Singapore
|
|
8.
|
Australia
|
|
9.
|
Saudi Arabia
|
|
10.
|
South Korea
|
Bridgerton%20season%20three%20-%20part%20one
%3Cp%3E%3Cstrong%3EDirectors%3A%20%3C%2Fstrong%3EVarious%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarring%3A%3C%2Fstrong%3E%20Nicola%20Coughlan%2C%20Luke%20Newton%2C%20Jonathan%20Bailey%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E3%2F5%3C%2Fp%3E%0A
Afcon 2019
SEMI-FINALS
Senegal v Tunisia, 8pm
Algeria v Nigeria, 11pm
Matches are live on BeIN Sports
Healthy tips to remember
Here, Dr Mohamed El Abiary, paediatric consultant at Al Zahra Hospital Dubai, shares some advice for parents whose children are fasting during the holy month of Ramadan:
Gradual fasting and golden points - For children under the age of 10, follow a step-by-step approach to fasting and don't push them beyond their limits. Start with a few hours fasting a day and increase it to a half fast and full fast when the child is ready. Every individual's ability varies as per the age and personal readiness. You could introduce a points system that awards the child and offers them encouragement when they make progress with the amount of hours they fast
Why fast? - Explain to your child why they are fasting. By shedding light on the importance of abstaining from food and drink, children may feel more encouraged to give it there all during the observance period. It is also a good opportunity to teach children about controlling urges, doing good for others and instilling healthy food habits
Sleep and suhoor - A child needs adequate sleep every night - at least eight hours. Make sure to set a routine early bedtime so he/she has sufficient time to wake up for suhoor, which is an essential meal at the beginning of the day
Good diet - Nutritious food is crucial to ensuring a healthy Ramadan for children. They must refrain from eating too much junk food as well as canned goods and snacks and drinks high in sugar. Foods that are rich in nutrients, vitamins and proteins, like fruits, fresh meats and vegetables, make for a good balanced diet
