The only way to truly defeat the tyranids in battle is to fight them in space, and even then, you'd need a lot of ships. Destroying this won't completely stop the inflow of more tyranids, but its possible that the beacon is drawing some sort of super-fleet that would most likely definitely eat everything all by itself..
Just so, can the tyranids be defeated?
One argument as to why people may say that the Tyranids are unstoppable is that the entire hive mind hasn't arrived yet and unlike other races kill a few billion of them they'd soon replace them, so based on that argument some might say whilst organic life exists within the galaxy the Tyranids cannot be defeated.
can the Tyranids defeat chaos? Yes the Tyranids could. Fluff wise the Tyranids have the best chance of stopping Chaos in the material world. Chaos is powerful because it feeds of the emotions, dream and actions of sentient beings, big and small. The daemons of the warp are literally born from emotions.
Also to know is, do tyranids avoid necrons?
Also Tyranids consume metal for minerals. If a fleet consumed a Necron tomb complex it would have lots of good minerals to make lots of strong carapace, teeth, talons and claws. They avoid them because it's a loose loose. The amount of biomass that they'd loose even if they won would be more than any they gain.
What controls Tyranids?
The Tyranids are aliens from outside the galaxy who have come to devour all life, one planet at a time. They are collectively controlled by a highly intelligent hive mind which can not be reasoned with. Tyranids come in diverse forms, each individual having been engineered to fulfill a specific role.
Related Question Answers
Will the Imperium of Man Survive?
Humanity will not win by itself, it can only survive. If the Imperium falls apart, and the Tyranids manage to consume life, even then pockets of human populations would have survived. Humanity indeed has Trillions, but it is not as numerous as the Orks, whoa are much better suited to survive even the Tyranids.Can the tau win?
There are at least two extra major empires we literally know nothing about. If the tau either absorb them or ally with them, they have a serious chance of winning. They are also the only ones able to ally with the imperium for any longer than a fight or two. The tau can also win by, well, not dying.Do tyranids have souls?
Tyranids don't have souls. They have a soul as much as a tree or a rock. They are a biological natural disaster that blindly follows instincts. They don't use the Warp.Do tyranids fight each other?
Hive fleets sometimes do fight each other. But the reason they do it is to weed out genetic material, its a giant weapons testing experiment with no lost biomass. the stronger fleet wins and in addition takes the best genetic material from the loser.Does the imperium take prisoners?
The Imperium would never take low level soldiers prisoner, unless they were accompanied by a high ranking prisoner who's cooperation they wanted. The Imperium also could take surrender from traitors, as long as they aren't heretical.Are tyranids good?
Tyranids have a lot of good toughness, decent save, high wound models, as well as lots of cheap, average toughness, low save models - not unexpectedly. Some units such as my beloved Carnifex are pretty cheap for their survivability, whilst others such as Trygons seem relatively fragile for their points cost.What do the necrons want?
the Necrons are searching for a suitable race to put their souls back into flesh bodies. They will have a servant race that they can put their souls back inside, getting a new body every time the old one dies.What do necrons call humans?
Orks call humans, "Humies" and Eldar "Pointy Ears" and Necrons "Botboyz" and Chaos as "Chaos Boyz."Who created the necrons?
The Necrons are a race of mechanical warriors, created from the Necrontyr. They have lain dormant in their stasis-tombs for sixty million years. They are ancient beyond reckoning, pre-dating even the Eldar.How many galaxies have the Tyranids consumed?
one thousand galaxies
Where did tyranids come from?
Origins. The Tyranids were first attracted to the Milky Way Galaxy when the xenos communication device known as the Pharos was overloaded in the Battle of Sotha during the Horus Heresy.Did the old ones create the Tyranids?
The Old Ones created the Tyranids in a bid to stop the necrons from attacking them. The Hive Mind acts as a sort of seed bank for the DNA of various species, so they can be re-created at a later date. The Tyranids were then sent to another galaxy.What do Tau think of space marines?
Space Marines are indoctrinated, and have fanatical loyalty to the Emperor and the Imperium, which extends to rabid hatred of their foes. Tau are heretics, xenos scum, and deserving of only death.How big are the Tyranids?
Gaunts have the size of poneys or mules. Tyranid Warriors are around 3 to 4 meters tall and so are Hive Guard and Tyrant Guard, but these are wider, longer and heavier.Is Hive Fleet Leviathan destroyed?
Following down the same road as its precursors, Hive Fleet Behemoth and Hive Fleet Kraken, Leviathan has now been largely destroyed, the Bio-Mass it absorbed and used in its creation lost to the Hive Mind.How powerful are necrons?
The Necrons are only powerful in their direct spheres of influence. They cannot extend that influence very far, but on their home turf they are literally unstoppable. All the Imperium would need to do to get rid of the threat the Necrons present, is order an Exterminatus on all of the known tomb worlds.What is the strongest race in Warhammer 40k?
The Imperium is currently the most powerful faction, but that isn't going to last. The Eldar were the most powerful faction before hand but now they are dying out.Can tyranids eat daemons?
Daemons, being creatures of the Warp, have neither DNA nor biomass for the fleet, so Tyranids probably ignore eating them for the most part. They have no reason at all to consume Daemons that are going to dissipate back into the Warp in a few hours.How powerful is the Imperium of Man?
The Imperium is the largest and currently most powerful political entity in the galaxy, consisting of at least 1,000,000 human-settled worlds dispersed across most of the Milky Way Galaxy. Consequently, an Imperial planet might be separated from its closest neighbour by hundreds or even thousands of light years. 
