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Nasa's Spitzer telescope has found seven Earth-sized planets orbiting around a single star. The star, a variant called as an ultra-cool dwarf star, is approximately 40 light-years or about 378 trillion kilometers from planet Earth.

The fact that the changes in the starlight are extremely minuscule means that nearly all the exoplanets discovered are in the Milky Way. According to NASA, New Horizons - at 32,000 miles per hour the agency's fastest spacecraft - would take more than 800,000 years to get there.

"It is also significant because it shows the existence of such exoplanets - planets outside of our solar system - around low-mass - smaller than the Sun - cool, red, dim stars, which are the most common types of stars in galaxies and which have long lifetimes", said the astrophysicist, who studies stellar evolution at the Vatican Observatory. Scientists have always claimed that this is observation bias - giant planets are easier to detect due to their size.

With the distance from Trappist-1 and with the size of the planets it is highly possible that one or more of these seven planets may have liquid water on them.

Nettles said even if further study "fails to reveal" gases on the planets "which might indicate biological activity", there "will be no dashing [some scientists'] hope" of life in TRAPPIST-1. These planets circled their star each 1.5, 2.4 and four Earth-days, individually, making them in the vicinity of 20 and 100 circumstances nearer to their star than Earth is to the sun.

"I been fascinated by astronomy for I would say most of my life.I certainly star gazed when I could and I had a little telescope when I was a kid as well so I was definitely interested in it", he said.

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Plus, it has seven potentially life-bearing planets, where we've just got the one and maybe, possibly, sometime in either the distant past or future, two.

Eventually, the team confirmed there were seven planets orbiting the star, three of which were especially exciting. The earth formed 4.5 billion years ago and the oldest evidence of life we have is from 3.8 billion years ago, and that too without oxygen.

But here is another thought: if we find no life on these planets, that doesn't mean it couldn't evolve there in the future. Most previous exoplanets we've discovered have been enormous gas balls, the size of Neptune and even Jupiter. Telescopes from the ground and telescope in orbit, like the Hubble Space Telescope, will add to the details of the new find.

Of course, the fact that all of these are at a distance from their parent star, where liquid water can exist, is what makes it even more important.

The Trappist-1 poster is the latest in a series of Nasa space travel posters to promote exoplanet science.

"There is at least one combination of molecules, if present with relative abundance, that would tell us there is life, with 99 percent confidence", said Gillon. Nonetheless, the system of planets is relatively close to us in the constellation Aquarius.