Possible Clues:

• Source of the food thickener carrageenan
• See 9
• Cost in total
• Regain consciousness (and a phrase that precedes the first word of 20-, 36-, and 51-Across)
• Wake up with heavenly body after love? Quite the opposite
• Revive space traveller with oxygen
• Goo Goo Dolls "___ Me"
• Bird sound over weather station? Snap out of it!
• Total return to consciousness
• Orb following celestial object's wake