Subject	force
Predicate	keep planets in
Object	orbit
Modality	Modality Occurrences some[subj/centripetal] 2 some[subj/gravitational] 1
Polarity	POSITIVE
Plausibility	0.0465
Neighborhood Sigma	0.0465
Local Sigma	0.0477
Example Sentences	Sentence Occurrences Source centripetal forces keep planets in orbit 1 Google Autocomplete gravitational forces keep planets in orbit 1 Google Autocomplete centripetal force keep planets in orbit 1 Google Autocomplete