Originally posted by Utrigita
Actually Galactus has also (along with Korvac) shown to be capable of avoiding nullification
Galactus has never withstood Nullification.
Galactus jumped into another dimension at the last second to escape getting erased:
Here is the Fact:
"Tyrant, Morg, Air Walker, GALACTUS....ALL are DEAD"
http://img76.imageshack.us/img76/7500/ddw2.th.jpg
..................................................................................
"They have been Consumed...ULTIMATELY NULLIFIED"
http://img291.imageshack.us/img291/8854/d2kk5.th.jpg
..................................................................................
"What being will take GALACTUS'S PLACE"
http://img291.imageshack.us/img291/3175/d3vf2.th.jpg
..................................................................................
"UNABLE to STOP or CONTROL the Nullifier, GALACTUS was OVERWHELMED"
http://img133.imageshack.us/img133/7854/d4xd7.th.jpg
..................................................................................
Morg discharged the Ultimate Nullifier in an effort to stop Tyrant,
but also apparently destroyed himself and Galactus.
Galactus survived by escaping extra-dimensionally
and was later summoned by Reed to oppose the power of Hyperstorm;
http://www.marvel.com/universe/Galactus
I did my own reasearch ofcourse, and it happened exactly like they said:
..................................................................................
After Reed travels through the Cross Roads of Infinity to find Galactus
Reed places a machine that can find various Spectrums of Energy
on the exact spot the UN was used by Morg:
http://img123.imageshack.us/img123/7712/d5lb0.th.jpg
..................................................................................
Reed's machine finds traces of a distinctive EXAUST TRAIL,
that could have only come from Galactus's World Ship:
http://img123.imageshack.us/img123/1307/d6og4.th.jpg
"This indicates that Galactus ESCAPED at the LAST MOMENT into a Parallel Dimension"
..................................................................................
Galactus in a Dimensionl Void, where he escaped to from the Ultimate Nullifier:
http://img123.imageshack.us/img123/448/d7nh9.th.jpg

..................................................................................
Korvac also separated his consciousness from his body to avoid getting erased.
That wasn't even an Omni-Blast.
That was a Uni-blast Galactus shot himself,
that searched for Korvac like Darkseid's Omega Beams.
So this really has nothing to do with nullfiying an entire Reality and escaping,
while standing within said Reality.
Korvac got erased when he used the UN to erase a Universe.