You will be given a definition of a task first, then some input of the task.
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].

The washing machine-sized Philae probe gripped the imaginations of the world when it landed on comet 67P on 12 November 2014. But after making two unscheduled bounces on the surface, the probe landed in an unknown location and ran out of power. Now, as the comet approaches the sun and solar rays recharge Philae's batteries, Rosetta mission manager Patrick Martin tells MailOnline he is confident of finding the probe soon - but it will be a race against time to get it working again. He warned that once the comet begins heading away from the sun in August it will enter hibernation again - but this time for good.Rosetta mission manager Patrick Martin told MailOnline he is confident of making contact with Philae on comet 67P soonThe probe has been silent since it ran out of power in NovemberEsa scientists in Germany recently failed to make contactBut Mr Martin said they have a '50:50' chance of making contact on 13 AprilHowever, they want to find it before the comet leaves the sun in AugustAfter this, the probe will eventually run out of power - this time foreverThe team wants to perform as much science as possible before then 
 Question:If _ can study and observe the comet on the approach, it could provide some fascinating insight into what happens to a comet during this phase.
Output:
Philae