A black hole located approximately 1,500 light years from our solar system, discovered in the constellation Monoceros, pulls at a nearby red giant star, distorting its light in an undated illustration. Ohio State illustration/Handout via Reuters
A black hole located approximately 1,500 light years from our solar system, discovered in the constellation Monoceros, pulls at a nearby red giant star, distorting its light in an undated illustration. Ohio State illustration/Handout via Reuters
A black hole located approximately 1,500 light years from our solar system, discovered in the constellation Monoceros, pulls at a nearby red giant star, distorting its light in an undated illustration. Ohio State illustration/Handout via Reuters
A black hole located approximately 1,500 light years from our solar system, discovered in the constellation Monoceros, pulls at a nearby red giant star, distorting its light in an undated illustration

Science

'Unicorn' black hole may be galaxy's smallest

Researchers say it is about three times the mass of the Sun

Reuters

April 23, 2021

  • English
  • Arabic

Scientists discovered what may be the smallest-known black hole in the Milky Way galaxy and the closest to our solar system – an object so curious they nicknamed it the Unicorn.

The researchers said the black hole is about three times the mass of the Sun, testing the lower limits of size for these extraordinarily dense objects that possess gravitational pulls so strong not even light can escape. A luminous star called a red giant orbits with the black hole in a so-called binary star system named V723 Mon.

The black hole is about 1,500 light years – the distance light travels in a year, 9.5 trillion kilometres – from Earth. While it may be the closest one to us, it is still far away. By way of comparison, the closest star to our solar system, Proxima Centauri, is four light years away.

Black holes like this one form when massive stars die and their cores collapse.

"We nicknamed this black hole 'the Unicorn' partly because V723 Mon is in the Monoceros constellation – which translates to unicorn – and partly because it is a very unique system" in terms of the black hole's mass and relative closeness to Earth, said Ohio State University astronomy doctoral student Tharindu Jayasinghe. He is the lead author of the study published this week in the journal Monthly Notices of the Royal Astronomical Society.

There are three categories of black holes. The smallest, like the Unicorn, are so-called stellar mass black holes formed by the gravitational collapse of a single star.

There are gargantuan supermassive black holes like the one at our galaxy's centre, 26,000 light years from Earth, which is four million times the Sun's mass. A few intermediate-mass black holes have been found with masses somewhere in between.

"It is clear that nature makes black holes of a wide range of masses. But a three-solar-mass black hole is a big surprise. There are no very good models for how to make such a black hole, but I am sure people will work on that more now," said Ohio State University astronomy professor and study co-author Kris Stanek.

The Unicorn falls into what the researchers called a "mass gap" between the largest-known neutron stars – objects similarly formed by a large star's collapse – at about 2.2 times the mass of the Sun and what previously had been considered the smallest black holes at about five times the Sun's mass.

"'The Unicorn' is truly one of the smallest black holes possible," Mr Jayasinghe said.

Nasa's Hubble Space Telescope captured the tiny moon Phobos during its orbital trek around Mars. Because the moon is so small, it appears star-like in the Hubble pictures. The Hubble observations were intended to photograph Mars, and the moon's cameo appearance was a bonus. Phobos is one of the smallest moons in the solar system. It is so tiny that it would fit comfortably inside the Washington, DC. Courtesy: Nasa
Nasa's Hubble Space Telescope captured the tiny moon Phobos during its orbital trek around Mars. Because the moon is so small, it appears star-like in the Hubble pictures. The Hubble observations were intended to photograph Mars, and the moon's cameo appearance was a bonus. Phobos is one of the smallest moons in the solar system. It is so tiny that it would fit comfortably inside the Washington, DC. Courtesy: Nasa
This is the first image of Saturn's ultraviolet aurora taken by the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST) in October 1998, when Saturn was a distance of 810 million miles (1.3 billion km) from Earth. Courtesy: Nasa
This is the first image of Saturn's ultraviolet aurora taken by the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST) in October 1998, when Saturn was a distance of 810 million miles (1.3 billion km) from Earth. Courtesy: Nasa
Astronomers are using the Nasa / ESA Hubble Space Telescope to study auroras — stunning light shows in a planet’s atmosphere — on the poles of the largest planet in the solar system, Jupiter. Courtesy: Nasa
Astronomers are using the Nasa / ESA Hubble Space Telescope to study auroras — stunning light shows in a planet’s atmosphere — on the poles of the largest planet in the solar system, Jupiter. Courtesy: Nasa
This colourful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6000 light-years away from us. Courtesy: Nasa
This colourful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6000 light-years away from us. Courtesy: Nasa
This majestic false-colour image from Nasa's Spitzer Space Telescope shows 'mountains' where stars are born. These towering pillars of cool gas and dust are illuminated at their tips with light from warm embryonic stars. Courtesy: Nasa
This majestic false-colour image from Nasa's Spitzer Space Telescope shows 'mountains' where stars are born. These towering pillars of cool gas and dust are illuminated at their tips with light from warm embryonic stars. Courtesy: Nasa
This Nasa Hubble Space Telescope photograph captures the chaotic activity atop a three-light-year-tall pillar of gas and dust that is being eaten away by the brilliant light from nearby bright stars. The pillar is also being assaulted from within, as infant stars buried inside it fire off jets of gas that can be seen streaming from towering peaks. This turbulent cosmic pinnacle lies within a tempestuous stellar nursery called the Carina Nebula, located 7,500 light-years away in the southern constellation Carina. Courtesy: Nasa
This Nasa Hubble Space Telescope photograph captures the chaotic activity atop a three-light-year-tall pillar of gas and dust that is being eaten away by the brilliant light from nearby bright stars. The pillar is also being assaulted from within, as infant stars buried inside it fire off jets of gas that can be seen streaming from towering peaks. This turbulent cosmic pinnacle lies within a tempestuous stellar nursery called the Carina Nebula, located 7,500 light-years away in the southern constellation Carina. Courtesy: Nasa
These eerie, dark, pillar-like structures are actually columns of cool interstellar hydrogen gas and dust that are also incubators for new stars. The pillars protrude from the interior wall of a dark molecular cloud like stalagmites from the floor of a cavern. They are part of the Eagle Nebula (also called M16), a nearby star-forming region 7,000 light-years away, in the constellation Serpens. Courtesy: Nasa
These eerie, dark, pillar-like structures are actually columns of cool interstellar hydrogen gas and dust that are also incubators for new stars. The pillars protrude from the interior wall of a dark molecular cloud like stalagmites from the floor of a cavern. They are part of the Eagle Nebula (also called M16), a nearby star-forming region 7,000 light-years away, in the constellation Serpens. Courtesy: Nasa
In this image provided by the Hubble Space Telescope (HST), the Omega Nebula (M17) resembles the fury of a raging sea, showing a bubbly ocean of glowing hydrogen gas and small amounts of other elements such as oxygen and sulphur. The nebula, also known as the Swan Nebula, is a hotbed of newly born stars residing 5,500 light-years away in the constellation Sagittarius. Courtesy: Nasa
In this image provided by the Hubble Space Telescope (HST), the Omega Nebula (M17) resembles the fury of a raging sea, showing a bubbly ocean of glowing hydrogen gas and small amounts of other elements such as oxygen and sulphur. The nebula, also known as the Swan Nebula, is a hotbed of newly born stars residing 5,500 light-years away in the constellation Sagittarius. Courtesy: Nasa
Nasa / ESA Hubble Space Telescope image reveals the heart of the Lagoon Nebula. Courtesy: Nasa
Nasa / ESA Hubble Space Telescope image reveals the heart of the Lagoon Nebula. Courtesy: Nasa
The Cat's Eye Nebula, one of the first planetary nebulae discovered, also has one of the most complex forms known to this kind of nebula. Eleven rings, or shells, of gas make up the Cat's Eye. Courtesy: Nasa
The Cat's Eye Nebula, one of the first planetary nebulae discovered, also has one of the most complex forms known to this kind of nebula. Eleven rings, or shells, of gas make up the Cat's Eye. Courtesy: Nasa
The Cone Nebula resides 2,500 light-years away in the constellation Monoceros. Radiation from hot, young stars (located beyond the top of the image) has slowly eroded the nebula over millions of years. Courtesy: Nasa
The Cone Nebula resides 2,500 light-years away in the constellation Monoceros. Radiation from hot, young stars (located beyond the top of the image) has slowly eroded the nebula over millions of years. Courtesy: Nasa
This planetary nebula's simple, graceful appearance is thought to be due to perspective: our view from Earth looking straight into what is actually a barrel-shaped cloud of gas shrugged off by a dying central star. Hot blue gas near the energising central star gives way to progressively cooler green and yellow gas at greater distances with the coolest red gas along the outer boundary. Courtesy: Nasa
This planetary nebula's simple, graceful appearance is thought to be due to perspective: our view from Earth looking straight into what is actually a barrel-shaped cloud of gas shrugged off by a dying central star. Hot blue gas near the energising central star gives way to progressively cooler green and yellow gas at greater distances with the coolest red gas along the outer boundary. Courtesy: Nasa
This image shows the galaxy Messier 94, which lies in the small northern constellation of the Hunting Dogs, about 16 million light-years away. Within the bright ring around Messier 94 new stars are forming at a high rate and many young, bright stars are present within it – thanks to this, this feature is called a starburst ring. The cause of this peculiarly shaped star-forming region is likely a pressure wave going outwards from the galactic centre, compressing the gas and dust in the outer region. Courtesy: Nasa
This image shows the galaxy Messier 94, which lies in the small northern constellation of the Hunting Dogs, about 16 million light-years away. Within the bright ring around Messier 94 new stars are forming at a high rate and many young, bright stars are present within it – thanks to this, this feature is called a starburst ring. The cause of this peculiarly shaped star-forming region is likely a pressure wave going outwards from the galactic centre, compressing the gas and dust in the outer region. Courtesy: Nasa

Its strong gravity alters the shape of its companion star in a phenomenon known as tidal distortion, making it elongated rather than spherical and causing its light to change as it moves along its orbital path. It was these effects on the companion star, observed using Earth-based and orbiting telescopes, that indicated the black hole's presence.

"Black holes are electromagnetically dark and so they are difficult to find," Mr Jayasinghe said.

Unlike some other black holes orbiting with a star, this one was not observed to be drawing material from its companion, which is 173 times more luminous than the Sun.

The only smaller potential black hole is one with a mass 2.6 times that of the Sun that was spotted in another galaxy, Mr Jayasinghe said.

Another team of scientists last year described a black hole about 1,000 light years from Earth, but other researchers questioned whether it is a black hole.

Whiile you're here
Syria squad

Goalkeepers: Ibrahim Alma, Mahmoud Al Youssef, Ahmad Madania.
Defenders: Ahmad Al Salih, Moayad Ajan, Jehad Al Baour, Omar Midani, Amro Jenyat, Hussein Jwayed, Nadim Sabagh, Abdul Malek Anezan.
Midfielders: Mahmoud Al Mawas, Mohammed Osman, Osama Omari, Tamer Haj Mohamad, Ahmad Ashkar, Youssef Kalfa, Zaher Midani, Khaled Al Mobayed, Fahd Youssef.
Forwards: Omar Khribin, Omar Al Somah, Mardik Mardikian.

The story in numbers

18

This is how many recognised sects Lebanon is home to, along with about four million citizens

450,000

More than this many Palestinian refugees are registered with UNRWA in Lebanon, with about 45 per cent of them living in the country’s 12 refugee camps

1.5 million

There are just under 1 million Syrian refugees registered with the UN, although the government puts the figure upwards of 1.5m

73

The percentage of stateless people in Lebanon, who are not of Palestinian origin, born to a Lebanese mother, according to a 2012-2013 study by human rights organisation Frontiers Ruwad Association

18,000

The number of marriages recorded between Lebanese women and foreigners between the years 1995 and 2008, according to a 2009 study backed by the UN Development Programme

77,400

The number of people believed to be affected by the current nationality law, according to the 2009 UN study

4,926

This is how many Lebanese-Palestinian households there were in Lebanon in 2016, according to a census by the Lebanese-Palestinian dialogue committee

WWE TLC results

Asuka won the SmackDown Women's title in a TLC triple threat with Becky Lynch and Charlotte Flair

Dean Ambrose won the Intercontinental title against Seth Rollins

Daniel Bryan retained the WWE World Heavyweight Championship against AJ Styles

Ronda Rousey retained the Raw Women's Championship against Nia Jax

Rey Mysterio beat Randy Orton in a chairs match

Finn Balor defeated Drew McIntyre

Natalya beat Ruby Riott in a tables match

Braun Strowman beat Baron Corbin in a TLC match

Sheamus and Cesaro retained the SmackDown Tag Titles against The Usos and New Day

R-Truth and Carmella won the Mixed Match Challenge by beating Jinder Mahal and Alicia Fox

Wicked: For Good

Director: Jon M Chu

Starring: Ariana Grande, Cynthia Erivo, Jonathan Bailey, Jeff Goldblum, Michelle Yeoh, Ethan Slater

Rating: 4/5

You might also like
While you're here
On Women's Day
While you're here

Sting & Shaggy

44/876

(Interscope)

UAE currency
CREW
%3Cp%3E%3Cstrong%3EDirector%3A%20%3C%2Fstrong%3ERajesh%20A%20Krishnan%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarring%3A%20%3C%2Fstrong%3ETabu%2C%20Kareena%20Kapoor%20Khan%2C%20Kriti%20Sanon%26nbsp%3B%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%203.5%2F5%3C%2Fp%3E%0A
BACK%20TO%20ALEXANDRIA
%3Cp%3E%3Cstrong%3EDirector%3A%20%3C%2Fstrong%3ETamer%20Ruggli%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarring%3A%20%3C%2Fstrong%3ENadine%20Labaki%2C%20Fanny%20Ardant%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E3.5%2F5%3C%2Fp%3E%0A
GRAN%20TURISMO
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Neill%20Blomkamp%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStars%3A%3C%2Fstrong%3E%20David%20Harbour%2C%20Orlando%20Bloom%2C%20Archie%20Madekwe%2C%20Darren%20Barnet%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%203%2F5%3C%2Fp%3E%0A
While you're here
The national orchestra
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

Recommended
On Women's Day
While you're here
Specs
%3Cp%3E%3Cstrong%3EEngine%3A%3C%2Fstrong%3E%201.5-litre%20turbo%204-cylinder%20%2F%202.0%20turbo%204-cylinder%20(S3)%0D%3Cbr%3E%3Cstrong%3EPower%3A%3C%2Fstrong%3E%20148bhp%20%2F%20328bhp%20(S3)%0D%3Cbr%3E%3Cstrong%3ETorque%3A%3C%2Fstrong%3E%20250Nm%20%2F%20420Nm%20(S3)%0D%3Cbr%3E%3Cstrong%3EOn%20sale%3A%3C%2Fstrong%3E%20December%0D%3Cbr%3E%3Cstrong%3EPrice%3A%3C%2Fstrong%3E%20TBA%0D%3C%2Fp%3E%0A
While you're here
School uniforms report
The Africa Institute 101

Housed on the same site as the original Africa Hall, which first hosted an Arab-African Symposium in 1976, the newly renovated building will be home to a think tank and postgraduate studies hub (it will offer master’s and PhD programmes). The centre will focus on both the historical and contemporary links between Africa and the Gulf, and will serve as a meeting place for conferences, symposia, lectures, film screenings, plays, musical performances and more. In fact, today it is hosting a symposium – 5-plus-1: Rethinking Abstraction that will look at the six decades of Frank Bowling’s career, as well as those of his contemporaries that invested social, cultural and personal meaning into abstraction. 

Electric scooters: some rules to remember
  • Riders must be 14-years-old or over
  • Wear a protective helmet
  • Park the electric scooter in designated parking lots (if any)
  • Do not leave electric scooter in locations that obstruct traffic or pedestrians
  • Solo riders only, no passengers allowed
  • Do not drive outside designated lanes
KILLING OF QASSEM SULEIMANI
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
Results

1.30pm Handicap (PA) Dh50,000 (Dirt) 1,400m

Winner Al Suhooj, Saif Al Balushi (jockey), Khalifa Al Neyadi (trainer)

2pm Handicap (TB) 68,000 (D) 1,950m

Winner Miracle Maker, Xavier Ziani, Salem bin Ghadayer

2.30pm Maiden (TB) Dh60,000 (D) 1,600m

Winner Mazagran, Tadhg O’Shea, Satish Seemar

3pm Handicap (TB) Dh84,000 (D) 1,800m

Winner Tailor’s Row, Royston Ffrench, Salem bin Ghadayer

3.30pm Handicap (TB) Dh76,000 (D) 1,400m

Winner Alla Mahlak, Adrie de Vries, Rashed Bouresly

4pm Maiden (TB) Dh60,000 (D) 1,200m

Winner Hurry Up, Royston Ffrench, Salem bin Ghadayer

4.30pm Handicap (TB) Dh68,000 (D) 1,200m