Yes, ORBITS is a Scrabble word!

Letter values in Scrabble US: O 1, R 1, B 3, I 1, T 1, S 1.

Is it a valid word?

ORBITS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the (usually elliptical) path described by one celestial body in its revolution about another
a particular environment or walk of life
an area in which something acts or operates or has power or control: "the range of a supersonic jet"
the path of an electron around the nucleus of an atom
the bony cavity in the skull containing the eyeball

Also: celestial orbit, electron orbit, eye socket, cranial orbit, orbital cavity.