"It is the farthest spacecraft from Earth, at a distance of about 130.62 AU (1.954×1010 km)" - this would sound better the other way around, At a distance of approximately 130.62 AU (1.954×1010 km), it is the farthest spacecraft from Earth.
I would recommend either expanding the short second paragraph in the lead or merging it with the first, if you prefer
"It also studied the weather, magnetic fields, and rings of those worlds" - planets?
"exploring the interstellar medium.Voyager 1 crossed" - there is no space in between that full stop
"As calculated automatically based on today's date, Voyager 1 only has 74.2% of the plutonium-238 that it had at launch. By 2025, it will have only 68.8% left." - completely unsourced and I would at least recommend expanding or merging this as it is too short for a standalone paragraph
The Computers section is largely unsourced
The middle of the Flyby of Saturn section contains no citations - I know that the material is in the sources given so it should be easy to give them citations
"riggered by a solar outburst that had occurred in March 2012[53] (Electron density is expected to be two orders of magnitude higher outside the heliopause than within.[55])" - syntax errors in this sentence, Election should not be capitalised in the brackets and the citation should also be outside the brackets
A very interesting article that only has a few minor syntax/prose issues that could be addressed with ease. Sorry for taking so long to review this as I've been ill over the past few days. I'll leave this on hold for the standard seven days until all of the above are clarified. Thanks! JAGUAR13:24, 22 May 2015 (UTC)[reply]