“Ad Astra” (2019) carries a ‘heart of darkness’ to the stars…

****ROCKET-SIZED SPOILERS AHEAD!**** Before I begin, I should warn a reader and/or prospective viewer that the trailers for “Ad Astra” are a tad deceptive. If one is looking for for the action-packed late summer thrill ride hinted at in the trailer? You’re outta luck. “Ad Astra” is much more languidly paced and introverted; more “2001/Solaris”…