Discovery of planet increases chances of extraterrestrial life

Astronomers have detected a second planet orbiting a star that could be at the centre of a solar system similar to ours.

Astronomers have detected a second planet orbiting a star that could be at the centre of a solar system similar to ours.

The discovery is yet more evidence that there may be many Earth-like planets in the Milky Way galaxy where extraterrestrial life could exist.

Already scientists have found more than 70 "exoplanets" outside our solar system. The latest recruit is about the size of Jupiter, the biggest of the nine planets orbiting the Sun.

The planet, which has not yet been named, is orbiting the star 47 Ursae Majoris in the Big Bear constellation some 50 light years away. The new planet is about three-quarters of the mass of Jupiter and orbits at a distance from its star that would take it between the orbits of Mars and Jupiter if it was in the solar system.

Scientists had previously found another planet, which was twice the size of Jupiter, to be in a circular orbit around the same star. A second planet suggests further planets may also exist.

One of the researchers, Debra Fischer of the University of California at Berkeley, said the latest planet brings astronomers closer to finding a distant solar system similar to our own. "For the first time we have detected two planets in nearly circular orbits around the same star. Most of the 70 planets people have found to date are in bizarre solar systems, with short periods and eccentric orbits close to the star.

"As our sensitivity improves we are finally seeing planets with longer orbital periods, planetary systems that look like our solar system," she said.

A team of astronomers from Washington's Carnegie Institution and Nasa made the discovery using two telescopes at the University of California's Lick Observatory. They detected the planet by measuring regular changes in the Doppler shift of starlight, which signals when the gravity of a planet is periodically pulling the star towards and away from the Earth.

Start your day with The Independent, sign up for daily news emails
  • Get to the point
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Ashdown Group: Front-End Developer - Surrey - £40,000

£30000 - £40000 per annum: Ashdown Group: Front-End Developer - Guildford/Craw...

Recruitment Genius: Customer Service Assistant

£13500 - £15000 per annum: Recruitment Genius: A Customer Service Assistant is...

Recruitment Genius: Sales Executive - OTE £35,000

£16000 - £35000 per annum: Recruitment Genius: An ambitious and motivated Sale...

Recruitment Genius: Gas Installation Support Engineer

£20000 - £23000 per annum: Recruitment Genius: A Gas Installation Support Engi...

Day In a Page

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

How a costume drama became a Sunday night staple
Miliband promises no stamp duty for first-time buyers as he pushes Tories on housing

Miliband promises no stamp duty for first-time buyers

Labour leader pushes Tories on housing
Aviation history is littered with grand failures - from the the Bristol Brabazon to Concorde - but what went wrong with the SuperJumbo?

Aviation history is littered with grand failures

But what went wrong with the SuperJumbo?
Fear of Putin, Islamists and immigration is giving rise to a new generation of Soviet-style 'iron curtains' right across Europe

Fortress Europe?

Fear of Putin, Islamists and immigration is giving rise to a new generation of 'iron curtains'
Never mind what you're wearing, it's what you're reclining on

Never mind what you're wearing

It's what you're reclining on that matters
General Election 2015: Chuka Umunna on the benefits of immigration, humility – and his leader Ed Miliband

Chuka Umunna: A virus of racism runs through Ukip

The shadow business secretary on the benefits of immigration, humility – and his leader Ed Miliband
Yemen crisis: This exotic war will soon become Europe's problem

Yemen's exotic war will soon affect Europe

Terrorism and boatloads of desperate migrants will be the outcome of the Saudi air campaign, says Patrick Cockburn
Marginal Streets project aims to document voters in the run-up to the General Election

Marginal Streets project documents voters

Independent photographers Joseph Fox and Orlando Gili are uploading two portraits of constituents to their website for each day of the campaign
Game of Thrones: Visit the real-life kingdom of Westeros to see where violent history ends and telly tourism begins

The real-life kingdom of Westeros

Is there something a little uncomfortable about Game of Thrones shooting in Northern Ireland?
How to survive a social-media mauling, by the tough women of Twitter

How to survive a Twitter mauling

Mary Beard, Caroline Criado-Perez, Louise Mensch, Bunny La Roche and Courtney Barrasford reveal how to trounce the trolls
Gallipoli centenary: At dawn, the young remember the young who perished in one of the First World War's bloodiest battles

At dawn, the young remember the young

A century ago, soldiers of the Empire – many no more than boys – spilt on to Gallipoli’s beaches. On this 100th Anzac Day, there are personal, poetic tributes to their sacrifice
Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves

Follow the money as never before

Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves, reports Rupert Cornwell
Samuel West interview: The actor and director on austerity, unionisation, and not mentioning his famous parents

Samuel West interview

The actor and director on austerity, unionisation, and not mentioning his famous parents
General Election 2015: Imagine if the leading political parties were fashion labels

Imagine if the leading political parties were fashion labels

Fashion editor, Alexander Fury, on what the leaders' appearances tell us about them
Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

The architect of the HeForShe movement and head of UN Women on the world's failure to combat domestic violence