Duran leads Al Nassr past Yokohama Marinos into AFC Champions League Elite semi-finals    Al Ahli cruise past Buriram into AFC Champions League Elite semi-finals    Saudi Arabia offers condolences to Iran following deadly Bandar Abbas port explosion    Saudi Arabia welcomes Palestinian leadership reforms, appointment of Hussein Al-Sheikh    Ministry of Hajj issued over 150,000 Nusuk cards for the Hajj of 2025    Saudi Arabia deports 12,866 illegal residents in a week    Pope Francis laid to rest at historic funeral in Rome    Massive explosion at Iran's Shahid Rajaee Port injures over 500 people    SFDA clears first 44-ton medical shipment for Hajj pilgrims    Over 13 million worshipers pray at Rawdah Sharif in a year    Saudi orchestra to perform at Sydney Opera House in May    Al Hilal thrash Gwangju to reach AFC Champions League Elite semi-finals    Nammos Amala Resort to open soon with Saudi-Greek designs    Saudi Arabia completes 674 Vision 2030 initiatives, achieves 93% of KPIs as ninth-year milestone marked    GACA chief chairs 16th meeting of the Steering Committee on aviation's strategy    Alkhorayef praises advancements in Al-Kharj food industries sector    Saudi Theater Commission launches its Work and Learn Project in UK    The season has begun — and one comment shook us all    Average life expectancy in Saudi Arabia rises to78.8 years    Famed Philippine film star Nora Aunor dies at 71    Pakistani star's Bollywood return excites fans and riles far right    Veteran Bollywood actor Manoj Kumar dies at 87    Bollywood actress vindicated over boyfriend's death after media hounding    Grand Mufti rules against posting prayers and preaching in mosques on social media    Exotic Taif Roses Simulation Performed at Taif Rose Festival    Asian shares mixed Tuesday    Weather Forecast for Tuesday    Saudi Tourism Authority Participates in Arabian Travel Market Exhibition in Dubai    Minister of Industry Announces 50 Investment Opportunities Worth over SAR 96 Billion in Machinery, Equipment Sector    HRH Crown Prince Offers Condolences to Crown Prince of Kuwait on Death of Sheikh Fawaz Salman Abdullah Al-Ali Al-Malek Al-Sabah    HRH Crown Prince Congratulates Santiago Peña on Winning Presidential Election in Paraguay    SDAIA Launches 1st Phase of 'Elevate Program' to Train 1,000 Women on Data, AI    41 Saudi Citizens and 171 Others from Brotherly and Friendly Countries Arrive in Saudi Arabia from Sudan    Saudi Arabia Hosts 1st Meeting of Arab Authorities Controlling Medicines    General Directorate of Narcotics Control Foils Attempt to Smuggle over 5 Million Amphetamine Pills    NAVI Javelins Crowned as Champions of Women's Counter-Strike: Global Offensive (CS:GO) Competitions    Saudi Karate Team Wins Four Medals in World Youth League Championship    Third Edition of FIFA Forward Program Kicks off in Riyadh    Evacuated from Sudan, 187 Nationals from Several Countries Arrive in Jeddah    SPA Documents Thajjud Prayer at Prophet's Mosque in Madinah    SFDA Recommends to Test Blood Sugar at Home Two or Three Hours after Meals    SFDA Offers Various Recommendations for Safe Food Frying    SFDA Provides Five Tips for Using Home Blood Pressure Monitor    SFDA: Instant Soup Contains Large Amounts of Salt    Mawani: New shipping service to connect Jubail Commercial Port to 11 global ports    Custodian of the Two Holy Mosques Delivers Speech to Pilgrims, Citizens, Residents and Muslims around the World    Sheikh Al-Issa in Arafah's Sermon: Allaah Blessed You by Making It Easy for You to Carry out This Obligation. Thus, Ensure Following the Guidance of Your Prophet    Custodian of the Two Holy Mosques addresses citizens and all Muslims on the occasion of the Holy month of Ramadan    







Thank you for reporting!
This image will be automatically disabled when it gets reported by several people.



Super-Earths ‘in the billions'
Published in The Saudi Gazette on 29 - 03 - 2012

There could be many billions of planets not much bigger than Earth circling faint stars in our galaxy, says an international team of astronomers. The estimate for the number of “super-Earths” is based on detections already made and then extrapolated to include the Milky Way's population of so-called red dwarf stars. The team works with the high-precision Harps instrument.
This is fitted to the 3.6m telescope at the Silla Observatory in Chile.
Harps employs an indirect method of detection that infers the existence of orbiting planets from the way their gravity makes a parent star appear to twitch in its motion across the sky.
“Our new observations with Harps mean that about 40% of all red dwarf stars have a super-Earth orbiting in the habitable zone where liquid water can exist on the surface of the planet,” said team leader Xavier Bonfils from the Observatoire des Sciences de l'Univers de Grenoble, France.
“Because red dwarfs are so common - there are about 160 billion of them in the Milky Way - this leads us to the astonishing result that there are tens of billions of these planets in our galaxy alone.”
The Harps team came up with its numbers after surveying 102 carefully chosen red dwarfs, which are dimmer and cooler than our Sun. The group found a total of nine super-Earths (which are defined as planets with one to 10 times the mass of the Earth), with two judged to be orbiting inside their stars' habitable zones.
Putting all its data together, including observations of stars that did not have planets, the team was able to produce an estimate for how common different sorts of planets are around red dwarfs.
This assessment suggests super-Earths in the habitable zone occur in 41% of cases, with a range from 28% to 95%. Given how many red dwarf stars there are in close proximity to the Sun, it means there could be perhaps 100 super-Earth planets in the habitable zones of stars that are less than about 30 light-years distant. “The habitable zone around a red dwarf, where the temperature is suitable for liquid water to exist on the surface, is much closer to the star than the Earth is to the Sun,” commented co-researcher Stephane Udry from the Geneva Observatory.


Clic here to read the story from its source.