"What other celestial objects (besides the sun) have a strong enough gravitational pull to distort the orbital paths of some planets such as Pluto?"
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Examining a SLIce of the Arctic
NASA-funded researchers have trekked to the arctic island of Svalbard in order to study how life survives in ice. Their research is also helping scientists develop new methods for detecting the presence of ice-dwelling organisms. The SLIce project will help astrobiologists understand how to identify life in surface ice on Earth in preparation for future missions to search for life on other planets, like Mars.
Source: [Astrobiology Magazine]
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