amazing doneTo weigh KOI-314c
To weigh KOI-314c, the scientists used a new technique called transit timing variations (TTV), which only works when more than one planet orbits a star
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The two planets tug on each other, slightly altering the time they take to cross or 'transit' the star's face
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Analysing the way the planetary wobbles affect light coming from the star makes it possible to calculate their mass
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KOI-314c's companion world is similar to it in size but weighs four times more than the Earth
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The new discovery was made by chance as scientists scoured data from the Kepler space telescope looking for evidence of moons rather than planets
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'When we noticed this planet showed transit timing variations, the signature was clearly due to the other planet in the system and not a moon,' said Dr Kipping.
'At first we were disappointed it wasn't a moon, but then we soon realised it was an extraordinary measurement
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