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Howard Smith, a senior astrophysicist at Harvard, made the claim that we are alone in the universe after an analysis of the 500 planets discovered so far showed all were hostile to life. Dr Smith said the extreme conditions found so far on planets discovered outside out Solar System are likely to be the norm, and that the hospitable conditions on Earth could be unique. “We have found that most other planets and solar systems are wildly different from our own. They are very hostile to life as we know it,” he said. He pointed to stars such as HD10180,...

In 2010, a star 127 light-years away stunned the world -- it had become the largest star system beyond our own, playing host to five, possibly seven, alien worlds. Now, the star (called HD 10180) is back in the headlines; it may actually have nine exoplanets orbiting it. Interestingly, HD 10180 is a yellow dwarf star very much like the sun, so this discovery has drawn many parallels with our own Solar System. It is a multi-planetary system surrounding a sun-like star. But it is also a very alien place with an assortment of worlds spread over wildly different orbits....

The announcement today of a newfound group of alien planets orbiting a distant star has added another candidate for the growing list of potential Earth-sized worlds beyond our own solar system. Astronomers still have to confirm the presence of the possible Earth-sized world. But they suspect it has a radius just 1.5 times that of Earth, which would make it the smallest alien planet yet found, if confirmed.

A solar system containing up to seven planets orbiting a sun-like star has been detected 127 light years from Earth. The planetary system is believed to be the largest ever discovered beyond the sun. Astronomers have confirmed the presence of five planets and have tantalising evidence of two more. And it comes as Nasa has said that it plans to make an announcement about an 'intriguing' planetary system that it has discovered using the Kepler space telescope Kepler looks at the telltale 'wobble' as planets pass in front of distant stars and, earlier this year, astronomers announced that it had...

Astronomers have discovered a group of at least five planets – with hints of two more – circling around a star in an arrangement similar to our own solar system. Confirmation of the extra planets would make this the highest tally of alien worlds ever spotted around a single star. The planets and their own sun-like star are about 127 light-years from Earth, astronomers with the European Southern Observatory said. It is one of just 15 planetary systems known to have more than three worlds. The five planets circle their parent star, HD 10180, in a regular pattern like the...

Astronomers have discovered a planetary system containing at least five planets that orbit a star called HD 10180, which is much like our own Sun.