1 detective

2 to do detective work

1 sky

1 to explore

2 to search out

3 to scout

4 to visit

5 to stretch forward

1 to explore

2 to probe

1 starry sky

2 the heavens

1 a worthless piece of paper (idiom)

1 the people are gone and the place is empty (idiom)

2 the sight of a deserted place brings old friends to mind

3 the place is deserted

4 the birds have flown

1 empty-handed (idiom); fig. not receiving anything

1 damaged by groundless slander (idiom)

1 a common occurrence (idiom)