Thanos: Are You ready to die naive?
Johhny: Sure
*removes mask*
Thanos: Was that supposed to do something?
Johhny: You know your dead right?
Thanos: What are you talking abou-
*looks down*
*sees own body*
Thanos: DAMN IT!
He did put the wizard Shazam into a coma. Didn't actually kill him, but the Wizards a good deal above Thanos level, going by how he did against Spectre.
While I can't say if exposure would kill Thanos its assured that something will happen to him.
My bet is Thanos falls into a coma or goes blind or something along those lines. To my knowledge no one has ever seen JS's face and been totally unaffected, even an Elemental (Captain Atom) was forced to Quantum Leap upon exposure.
__________________
“Where the longleaf pines are whispering
to him who loved them so.
Where the faint murmurs now dwindling
echo o’er tide and shore."
-A Grave Epitaph in Santa Rosa County, Florida; I wish I could remember the man's name.
The fact that Shazam "barely had the energy to stand" after his fight with Mordru and yet still gave the Spectre a fight demonstrates that at full power he might have beaten the DOV Spectre.
__________________
“Where the longleaf pines are whispering
to him who loved them so.
Where the faint murmurs now dwindling
echo o’er tide and shore."
-A Grave Epitaph in Santa Rosa County, Florida; I wish I could remember the man's name.