The best replacement for planets is stars.

The best alternatives to planets are rated as following:

★★★★★	stars
★★	outer planets
★★	jovian planets
★★	moons
★	suns
★	solar system
★	earth
★	terrestrial planets
	asteroids
	stars twinkle
	planets
	gas giants
	dwarf planets
	brown dwarfs
	galactic empire
	eight
	terrestrial
	distance between jovian planets
	galaxies

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Speaking about planets, one probably shouldn't forget about moons.

Other search terms related to planets and their ratings are:

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planets

stars

outer planets