Can't just "blow" the Hulk up silly Han, the big thinkers of the marvel community saw him as a threat and flung him at the Sun. He survived that conquered another planet and came back to Earth and started murdering every super hero he felt was involved (See World War Hulk)
Actually, from what I recall, the intent was to aim him at an unpopulated planet before he ended up in the wrong place. They never tried to send him into the sun.
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