Raw, the Novalith isn't OP by any means.  In fact, it too can be countered, though in the case of the Novalith, by Auxiliary Government or the racial equivalent.  Now, you can say, "But it's so expensive to do that!" to which I respond saying that there are economic possibilities with starbases.  All races have trade ports plus something else.  TEC actually has two levels of trade ports, Advent has culture, and Vasari have Colony Pods.  Oh, and Planetary Shields, Hardened Cities, and Fortification Specialists will also all deal with the damage to the planet.

The ability to nuke planets actually has almost nothing to do with its power.  The real reason why its useful at all is it drastically reduces the income from that planet for an extended period (both trade and tax).  

Novas are strategic weapons with a small tactical element to them, yet people never note the strategic parts while only noting and claiming the tactical component is OP even though its not.  Beyond that, the devs added a superweapon cap just because some SP couldn't defend themselves against it.

As for the DE, it is widely agreed upon as the weakest superweapon because culture centers counter it so easily.  That said, you have to consider that it helps the Advent fight in their culture and also gives a 25% boost to damage for all friendly ships in the gravity well.  For the AL in particular, this makes them quite powerful and much more difficult to kill.

That said, its still kinda UP, so people have made suggestions for things like making it capture the culture centers in the enemy well.  There was actually a lot of discussion on this before the Vasari were added (and with them, a slew of significantly more problematic balance issues).

If you want to talk about the most powerful superweapon, there's only one option left, the Kostura Cannon.  Sure, the disable isn't as useful against economies as the Novalith, but it is the most tactical of the superweapons and is far more powerful in a game, particularly when used by the VR or when playing with capital victory.  You see, beyond the disable, it does something else: it creates a phase node.  That means that you can jump your entire fleet to that planet and wipe it and surrounding rear-world eco planets out with minimal resistance.

OP, the TL aren't the strongest race by any means.  In fact, they're one of the weaker ones and seldom played on MP because the Novalith isn't all it's cracked up to be, particularly since the superweapon cap.  The TL turtle and build superweapons to soften their enemies.  Against a player who knows how to defend against it (just upgrade your planets' health for starters or build starbases), it really isn't hard to take the blows.  You just have to know how to take them.

Go to the gameplay.constant.

Find this line.

maxNumberOfCannonsPerPlayer 4

Change the 4 to 0.

Can't you research planetary shields, or max out out the planetary emergency response. When I have those the cannon takes more than 2 hits to destroy a planet even the smaller asteroids.

By that time I would have figured where the enemy is firing from, and take out those cannons.  

How lazy is it to manually take things out of a great game instead of learning to deal with the problem?

When you played monopoly did you cover Go to Jail? 

Except that starbases can be used to buff your own economy.

Novas aren't a problem once you learn to deal with them.  On top of the fact that you can prevent the loss of your planets with starbases, if you're as good as you suggest in the OP, why didn't you just break through the TEC defense and take out the Novas?

As for their cost, they still cost almost as much as a titan unless you have Novalith Deregulation (a tech that personally, I don't like; I'd rather it increase the number of superweapons that a player can build by 1 or 2 as it would help the TL which as a whole is a rather weak race).

Once again you are right, BUT. And this BUT would be that a Starbase, upgraded to that point costs as much as a Capital Ship or two. Sure, you can show the TEC, rolling in a full fleet, how well your Starbase acts as tradeport, but i rather doubt it would stop his progress.

Lets put it in a different way - you loose with every planet he destroys ~1/4 of what he paid for his cannon, if the planet is halfway upgraded. If it takes you one hour to get to the weapon, half of your system will be annihilated and if you build Starbases to prevent it, you wont have a fleet strong enough to oppose his, as you spent the tenfold of what he paid for the Superweapon.

Terran Planet + Vulcan + Ice, at the other end of a system with 50 planets. All the military labs there, between at least 10 jumps through his sectors, full with turrets/starbases/defense fleets. How do i take that cluster out by nagging with my religion on it? Sure, the Kostrua will simply make a portal, but Advent...

I mean, i had this situation, he had NC, i had DE, both 4 of them. He is simply destroying my planets, im slowly sawing his Allegiance. In the end half of my planets were down, no ressources and he lost 2 planets due to overthrow he gave not a single **** about

Im not saying its impossible to win agains TEC with NC, or that DE were underpowered (basically poisoning the enemy long-term), but it allows to put up cheap strategies rather than creating a complicated battle tactic. Maybe im just too noob to see the greater meaning and the awesome possiblities in those weapons, but to me they are just annoyingly out of place.

Im terrible at combat, im just good vs NPCs, and even have problems vs Hard.

I bet its extremely stupid to build only Capital Ships and that there is a realy easy way to take my fleet out with the proper counter.

However, its a game, that is fun to play with friends, and most of them are considering superweapons as overpowered, so i searched your advice to either explain why they arent OP or how to disable them. 

Since i got both, im quite happy and thankful (for now^^)

I can.  Go ahead and build some space stations in your orbits and enable the auxiliary government compartment.  It prevents you from losing a planet when it gets bombed to 0 population.  You should be getting this tech at around the same time as the TECs deploy their cannons, so shift gears before going too far into the offensive.

As a specific defense against Novaliths, it's fool-proof.  I do it in every game I've played, since getting Rebellion. 

If you anticipate dragging your heels about it, launch strike missions instead.  Your titan alone can Hail Mary pretty far, and the cannons never take more than a minute to whittle down.  You basically hand the TEC an enormous repair bill, and buy yourself some time.  Just make sure not to mistake the enemy's fortifications, it'd be bad to lose your titan / strike force.

And if you're still unwilling to do this - hey I understand.  I once sat at my desk and determined which letters in the English alphabet can occasionally be silent.  I just wasn't going to do work that day.  So don't be embarrassed - but if you are unwilling to do strike forces, hand out missions to your allies.  "Attack tactical structures".  I've done this occasionally, to some scant success.

PS: with interpretative concessions, it's almost all the letters.  Consonants often modify their preposition letters, generating entirely different phonemes.  An example is the interdental fricative, "TH", in which technically neither a "T" nor an "H" are emitted by the speaker.  What's left after consonant modifications are letters like Z, X, and V.  For consistency I ruled out words that are overtly foreign, and considered only the standard letters in the English alphabet, with consideration to dialect variation.  Informal omissions don't count, since they're likely to blanket any phone created in speech. 

Peace Out, Seacrest.

The nove is not overpowered. In fast I find it rly useless since i only play SP and with the AIs econ cheat the nova doesnt rly help any. Through the DE is still weaker technically speaking but it still has a better use in helping out in attacking worlds. The Kostrua is the most powerful super weapon since it opens a phase node on the worlds it hits so both the nova and the DE needs a buff.

Grr, now i have to try all those tactics out XDDD

Well, putting it this way, they arent that bad as long as you dont let them catch you unprepared. Thx for the hints and strategic solutions.^^