Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A solar system including five Earth-sized planets has been discovered which is so ancient it was born not long after the dawn of time - and experts say it could help find life on planets far older than we expected. The system's parent star, named Kepler-444, is 117 light years from Earth and 11.2 billion years old. When the sun-like star was formed out of a primordial cloud of gas and dust, the universe was just a fifth of its current age. Astronomers made the discovery after trawling through four years' worth of data collected by Nasa's Kepler space telescope.Solar system's parent star, named Kepler-444, is 117 light years from Earth11.2 billion-year-old star formed when the universe was a fifth of its ageFive Earth-sized planets orbit the star with years equivalent to 10 daysFind shows Earth-sized planets have formed throughout universe's history 
 Question:However, the chances of an advanced race of beings living on any of the planets are remote, despite _ being 25 per cent smaller and 700 degrees cooler than the sun.

Kepler-444