Things get more confusing everyday, last time I played a smash removed the entire target planet, and just now only my base was destroyed. Or was it a bug?
Yep, now the planets do damage determined by their and the target planets size. I didn't test it yet, but you even should be able to crash a larger planet through a small moon.
If Halley-moon/planet is smaller than target: Area annihilation depending on size of the Halley moon/planet If larger: Replace the target one (I think) If same: Both get annihilated.
Proportional smashes are fun. However, it would be nice to know whether the impact will only destroy part of the planet or all of it. I tried to go for a tactical planet smash to destroy a base earlier. Vaporised the entire planet.
No idea, My base was destroyed a few vanguards near the enemy base survived the impact, probebly because they were outside the damage zone. The planet wasn't that big so it must have been a very small moon I guess.