# How safe would be living in a space-time highly distorted planet

Imagine a planet - henceforth Planet X - that is orbiting very close to a black hole. The space-time distortion will be very high there and according to the theory of relativity, the time there will pass slower than for the rest of the universe.

For those who have watched the movie Interstellar, it's similar to the first planet the mission visits (the one close to the Gargantua black hole).

In order to make the things more visual, let us assume a planet where the distortion is so strong that we have the next equivalence:

1 hour in Planet X = 10 years in the rest of the universe.


Now imagine the Earth sends several missions to Planet X, 1 every 10 years for 100 years.

The planet will receive those missions within the same day. The first mission to arrive will have to wait only 1 hour to meet the second mission that departed from Earth 10 years later.

Therefore, we see here that Planet X is very vulnerable in the way that a potential enemy could gather many "ships" and "troops" there in only a few hours, while actually taking decades to build that army. This way, the planet would be easily invaded.

However, the enemy would need a lot of time in order to invade Planet X, so much that it would not make sense to actually do it. Any resources on Planet X would need many years to be exported to the enemy planet.

## migrated from space.stackexchange.comFeb 13 '18 at 16:20

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• "1 hour on planet X = 10 years in the rest of the universe" - this is not how relativity works... – Aify Feb 13 '18 at 16:30
• So... What problem are you trying to solve? – Frostfyre Feb 13 '18 at 16:40
• Welcome to WorldBuilding.SE! I've edited your question slightly to try and make it easier to understand; if it conflicts with your intent, please feel free to revert it. I must admit, however, that I'm not sure what your actual question is. Could you edit it further to make it clearer what you're asking? – F1Krazy Feb 13 '18 at 16:40
• “Safe” from what perspective? Vs an enemy army you have kind if answered your own question. The only defense the slow planeteers have is that no one will care enough to start a campaign against a planet that will end in 1000s of years. Also why not just point 10,000 nukes at this planet and have them enter from all sides and see the inhabitants scramble to combat the synchronized attack? Why bother sending people? – Tyler S. Loeper Feb 13 '18 at 17:46
• A friend of mine just told me about a book called Incandescence by Greg Egan which is basically about this. – Muuski Feb 13 '18 at 19:37