All quotes are from Gurbani, Guru Granth Sahib Ji. Page references are given at the end.

Gurbani talks about aliens. These are also devoted to Him – so they are called `devotees'.

"In the place of Mercy, the devotees of many worlds live there. They celebrate; their minds are filled with the True Lord. In the place of Truth, the Formless Lord lives. Having created the creation, He watches over it. By His Glance of Grace, He gives happiness. There are planets, solar systems and galaxies. If one speaks of them, there is no limit, no end. There are worlds upon worlds of His Creation. As He commands, so they exist. He watches over all, and thinking about creation, He celebrates. O Nanak, to describe this is as hard as steel! || 37 || (page 8)

These "devotees of many worlds" live in places designed for God. "He created millions of universes as places to practice righteousness. (page 1156) Our earth is only one of them.

PAUREE: You alone know Your greatness — there is no one else as great as You. If there were some other rival as great as You, then I would speak of him. You alone are as great as You are. One who serves You finds peace; who else can compare to You? You are all-powerful to destroy and create, O Great Giver; all stand begging before You, with their palms pressed together. I see none as great as You, O Great Giver; You give in charity to the beings of all the continents, worlds, solar systems, nether regions and universes. || 3 || (page 549)

God cares for life all over the universe, and not only on earth.