May I suggest https://en.wikipedia.org/wiki/The_Expanse_(novel_series)

Heinlien, The Moon is a Harsh Mistress, 1966

https://en.wikipedia.org/wiki/The_Moon_Is_a_Harsh_Mistress

The moon colony uses this to win its freedom.

However, The Expanse is also a great book

Related: Footfall and Lucifers Hammer (Both by Niven and Pournelle)

Hopefully better than the TV show. Man, that was a terrible ending.

It is better, and yeah for anybody who read the series the ending was especially awful. It's been awhile but I feel like they packed at least one book into the last 2-3 episodes of the last season. The book series still has a weird 30 year jump, but you stay there awhile at least.

For the first few seasons of the show I thought they did a good job, even though (or maybe because?) the show departs from the books in a lot of ways. But they tried to cram way too much into the last season and just made it seem like jibberish.

The book ending ("and then they gave up") put me off so much that I never bothered finishing the TV series. Given that, any thoughts on how I might find the TV series ending?

Worse than the books. They try to pack so much into the last few episodes that -- to me at least -- it didn't even make sense.

If you have the technology to push big space rocks onto a collision course, you have the technology to push big space rocks off a collision course.

Interception is a different process and usually it is more difficult.

Example of it being different process: bullets are accelerated by gun powder, but stopped by various armor.

Example of increased dificulty: interception rockets have higher demands on speed and agility. (If somebody tries to evade, you have to be faster)

The difference there being that a bullet's velocity is significantly increased by the gun, not simply redirected.

The problem of intercepting an asteroid heading towards you is exactly the same problem as intercepting an asteroid heading along any other orbit. Again, if you can redirect an asteroid, you can redirect an asteroid.

A more apt analogy would be a sword fight, where the counter to someone swinging their sword is swinging your own sword to redirect it.

Good point, but I am not ready to concede. (At least not fully)

Important limitation can be earlyness of detection, and equipment delivery/deployment speed, and redirection rate/speed.

Attacker could work with slow equipment deployment and redirection rate (maybe take years), but defender will need certain ratios between detection esrlyness and speedy deployment of equipment to start the deflection.

And if I’m mr Evil, I would pass the commet through some gravity assists to increase the speed - to bring the example closer to the bullet case.

As long as you can see them in time.

Kind of part of the plot to "The Moon Is a Harsh Mistress"

"The war after the next world war will be fought with sticks and stones" gains a new meaning. What would the sticks be though? Thor rods?

You might like planetary annihilation

https://planetaryannihilation.com/

This is a plot point in the Bobiverse books.

The delta-v required for a heavy asteroid may make it more practical to send a fleet of nukes though.

Future earth wars will have bombardments from space, no need to wait until we are on other planets.