Subject	space probe
Predicate	be used
Object	to explore the solar system
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7982
Neighborhood Sigma	0.9032
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source space probes are used to explore the solar system 2 Google Autocomplete, Answers.com Questions