Is there any planet without its star?
Is there any moon or any planet wandering in outer space without a definite orbit?
(The name moon or planet used here serves only for size and spherical shape notion.)
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João Bosco asked: Is there any planet without its star?
They are called rogue planets, and of course there can also be rogue moons: for example, a regular planet can lose its moon when a rogue planet comes too close and disrupts the system the moon can be ejected.