Yes, Thor can destroy Mjolnir, though it's an incredibly difficult feat.
While Mjolnir is famously durable and enchanted, it's not indestructible. The reference provided outlines an instance where Thor, driven by necessity, successfully shattered Mjolnir.
Here's a breakdown of how he accomplished this:
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The Situation: Thor faced Exitar, a Celestial Executioner. Stopping Exitar required penetrating its defenses and attacking a critical point within its inner “head dome.”
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The Method: Thor wrapped Mjolnir in his Belt of Power (Megingjörð), an artifact that enhances his strength. He then channeled his life force into Mjolnir and struck the Celestial.
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The Result: Thor successfully breached Exitar's defenses, but the immense strain caused Mjolnir to shatter completely.
It's important to note that this event highlights the extreme circumstances and the immense power Thor had to exert to destroy Mjolnir. It wasn't a casual act, but a desperate measure taken during a crisis. Furthermore, Mjolnir has been destroyed and reformed multiple times in the comics, often through similar displays of incredible force, cosmic events, or powerful magic.