Those who survived the end of Maldek 65 million years ago were pretty traumatized by this

 As you can imagine when your planet comes apart piece by piece over a month or two from the imbalances created by the 3 nukes that went below the mantle into the Magma (accidentally?) it sort of reminds one of Israel's genocide of the Palestinians in some ways (only in Maldek's case it was suicide of everyone and all cultures then.

Why did this happen? 

It was caused by two groups of fundamentalist zealots which reminds me a lot of say Israel and ISIS maybe butting heads or Israel and Iran?

Something like this where things got pretty insane.

So, somebody on one side thought it would be a great idea to eliminate completely from the planet Maldek the main military base of the other side.

So, this is what they did. 

They designed something that would blow up on the three points of a triangle and take out completely the enemies main military base.

It would be a lot like dropping 3 nukes and taking out All of Washington DC, the Pentagon and the CIA and NSA all at once. This is what they did.

What was the problem with this?

They didn't realize this would blow up as deep as it did and go all they way down to the magma.

So, literally all the land was gone. Imagine deep deep bunker busters that were made of nukes maybe 50 to 100 kiloton nukes or more and you put these in bunker busters into some place like Washington DC or Moscow or Beijing. Yes. it is true that those places would all be gone.

However, what else have you done?

You have blown away all the earth above the magma so you now have magma spilling all over the place in all directions frying everyone into crispy critters.

You have also blown away the dirt and land and rocks a lot into space and then all this that doesn't make it into space falls down on people's homes and kills them.

Then you have the oceans going and meeting the Lava because the mantle is gone.

Then you have oceans and lava meeting and blowing up in steam more land and water into the sky which then comes down and kills more and more people.

And because this base was near the ocean soon it isn't just the lake nearby feeding steam blowing up the land pretty soon the whole ocean becomes involved.

Then as more and more chunks are blown up by the steam eventually the whole planet becomes unbalanced and no longer round. 

What happens if you take a chunk off a spinning top that is balanced before but not after all this?

That's right it starts to wobble.

So, all this got worse and worse and worse until the whole planet eventually atmosphere, water of oceans and all was scattered into space and people died mostly from burning lava or steam burns or rocks coming out the sky down on them from the steam blowing them up and then the atmosphere going out into space and then balls of water forming in outer space into ice comets (likely some of the comets moving around made of ice came from Maldek 65 million years ago.

This is how billions of people (likely around the same number as now) died 65 million years ago.

How many survived of those billions and came to earth.

I would say it was 10,000 to 20,000 family members of the governments of earth and the military officers families of of those governments of Maldek.

Everyone else died horribly 65 million years ago on Maldek when it fell apart in millions of pieces and some of those pieces are still traveling outside our solar system and hitting stars and planets in all directions but most likely are still inside our galaxy for a variety of reasons. 

It is my present belief that wolves are not native to Earth but come from Maldek. And they howl at the moon because it is the largest piece of Maldek in one piece still in our solar system.

it wasn't round 65 million years ago but a lot of things have chipped it into the form it's in that have hit it during those 65 million years so it looks like it does now.

Do I expect you all to believe this?

That's not what's important here.

What is important is people understand our history as humans here on earth.

So, Earth doesn't suffer the same fate.

However, on one level that cannot happen because the Galaxy would now prevent it by changing time lines even if they earth was blown up.

What they would do is to go back in time and prevent the births of everyone even remotely responsible for nuking earth out of existence and then alter time and make things the way they were before it was nuked out of existence on that particular timeline.

And even if Earth could possibly be nuked out of existence and stay nuked (which it can't) there could be thousands of other timelines where earth still existed also. This is true throughout the Galaxy by the way.