Sol

HELP : 

Level 1 : hover a continent for a few (6s on each to be sure) seconds, expect an unusual sound to play for one of them 

 Level 2 : search for the greater signal (3 different signals), watch the red line

Level 3 : hold clic to browse map, find the spaceship hidden

Level 4 : click the yellow buttons when they appear

CHEAT :

You can press [0] to bypass current phase.