Об­ра­зуй­те от слова POSSIBLE од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

In 1970, some scientists began to question whether Pluto was really a planet. As technology improved the __________________ to see the outer areas of the solar system, they found other objects like Pluto. However, they decided that these did not have enough mass, or quantity of matter, to be considered a planet.