Cosmos Quest I: To Find A Sun
Description from the announcement thread: The Sun slowly fade out under submission of a black hole that no one knew before. Executing your duties as an engineer in a crew that observes the temperature of the Sun, you (Apo Lanski) notice a small problem with the shuttle when you just started your night shift.
Official website: http://www.cosmos-quest.com/
Release announcement by Kinanev with follow-up walkthrough available at http://www.adventuregamers.com/forums/showthread.php?t=17503
Walkthrough by Leon available at http://gamesolutions.efzeven.nl/cosmos-quest-to-find-a-sun-walkthrough-kinanev2005/