we can only see stars that are in our "horizont" its like when you look at the sea and you cant see further than your line of sight,the horizont is the end of our line of sight... or something like that
edit: this is what i found at a croatian site :
http://www.bug.hr/bugvideo/svemir-beskonacan/1764.aspx
edit: i think someone requested a pic of gliese so here it is:
