What do the following phrases have in common?

1. Tear asunder
2. Come to nothing
3. Grammar school
4. Plane tickets
5. Takes a turn
6. Snail's pace
7. Dastardly villain 
8. Hear things
9. Seven ushers

HINT:
Look for hidden words.

Answers:

Each phrase contains a hidden word related to our solar system or the universe.

1. tear aSUNder
2. COME To nothing
3. gramMAR School
4. PLANE Tickets
5. takeS A TURN
6. snail'S PACE
7. daSTARdly villain
8. hEAR THings
9. seVEN UShers

Credit: LA Times Crossword
Sylvia Bursztyn and Barry Tunick
HIDDEN UNIVERSE