SEVEN Earth-like planets – three of which could support alien life just 39 light years away

SEVEN Earth-like planets – three of which could support alien life just 39 light years away

SEVEN Earth-like planets – three of which could support alien life just 39 light years away

0 comments 📅22 February 2017, 22:41

Astronomers have spotted a star system with planets that could support life just 39 light years away.

Seven Earth-like planets have been discovered orbiting nearby dwarf star ‘Trappist-1’, and all of them could have water at their surface, one of the key components of life.

Three of the planets have such good conditions, that scientists say life may have already evolved on them.

Researchers claim that they will know whether or not there is life on any of the planets within a decade, and said ‘this is just the beginning.’

No other star system discovered before has been found to have such a large number of Earth-sized planets.

The planets likely have rocky compositions like Earth, are around the same size as our planet, and six have surface temperatures between 0-100°C (32-212°F).

This gives these planets some of the vital atmospheric conditions needed to grow biological life.

The Trappist-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This graphic shows how the outer orbiting 1h is an icy planet, while inner orbiting 1b, 1c and 1d are likely to be hot and dry. Though the researchers claim that all seven planets could feasibly have water at their surface, it is planets 1e, 1f, and 1g that are most likely to have water oceans

The researchers suggest that three of the seven planets, found in the system’s ‘habitable zone’, could have oceans of water with life evolving on them already.

‘We now have seven planets that we can study in detail for life, and this is something we are already doing,’ lead-author Michaël Gillon, an astronomer at the University of Liège, Belgium, said.

‘People will hear more and more about this system in the coming months and years.’

Each planet, labelled 1b-1h, was found via telescopes using the ‘transit’ method.

This is when the orbit and other properties of planets are measured as they pass in front of their star, causing it to briefly dim.

An international group of researchers used a series of space and ground-based telescopes to find the seven planets in the Trappist-1 system.

Telescopes used include a telescope owned by Liverpool John Moores University in La Palma, as well as Nasa’s Spitzer Space Telescope found in Earth’s orbit.

The researchers measured the ‘transits’ of planets by taking measurements of dips in the Trappist star’s brightness as planets passed in front of it.

This chart shows, on the top row, artist impressions of the seven planets of Trappist-1 with their orbital periods, distances from their star, radii and masses as compared to those of Earth. The bottom row shows data about Mercury, Venus, Earth and Mars. The seven planets’ orbits are closer to their star than Venus, Earth or Mars, and are therefore significantly shorter

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