Word meaning "find the truth of"?

The closest word I could think of was quest or journey. But I think they don't imply a "search for truth". Here's an example of what I'm looking for:

Now I had the strength to continue [...] about UFO's.

Solution 1:

Now I had the strength to continue pursuing the facts about UFOs.

Solution 2:

The phrase uncover the truth suggests a quest for something hidden or elusive. Merriam-Webster offers this definition and example for uncover

to make known : bring to light : disclose, reveal: uncover the truth

Similarly, seek out the truth.

Solution 3:

Now I had the strength to carry on my research about UFO's.