I first heard an excerpt of this music in the closing of the How Far Back is the James Webb able to See? with Dr. Klaus Pontoppidan video by Event Horizons. I was fascinated by it and requested details of the music in the comments section and Event Horizons kindly responded to me.
Ascent was released on Stellardrone‘s 2010 album Sublime.
Stellardrone is a pseudonym of amateur composer (Edgaras, b.1987, Lithuania, Vilnius) who started creating music in 2007. Using only computer software (Reason, Ableton, Audacity) and virtual synthesizers. He is mostly interested in ambient/electronic/space music and releases all albums for free (with an option to donate/buy) and promotes free sharing of digital copies.
You can find more music and information about Stellardrone at his following websites:
Bandcamp, Facebook, Soundcloud, Last.fm, & Myspace
Ascent is one of the very few ambient tracks I have presented here at OB. I find it alluring to listen to…so spacey, so dreamy. Try listening to it gazing out a window.
“The more I live, the more I learn. The more I learn, the more I realize, the less I know.”- Michel Legrand
Observation Blogger 
Beautiful! I like ambient, atmospheric compositions.
Yes, I’m chuffed you like it. The producers of the original doco were very prompt in responding. It was impressive.