nachikethas

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do anyone here know abt nachikethas, he is a child mentioned in katho upanishad{also known as katha upanishad} in hinduism. this upanishad is saying tht heaven is only a world in other dimension and there too people or gods all have death,but the real immortal situation is with brahmom, which means tht swarga in hindu concept is a world of another dimension,it says tht heaven is the world were devaas{gods} can be found,so i think the gods in hinduism are aliens which helped hinduism to grow, naraka means hell which consists of asuras means the worl were we can see evils means it is a world in other dimension consisting aliens who are against this world, but my real doubt is about nachikethagni,it is said in tht upanishad tht there is a devise known as nachikethagni which helps us to visit swarga,means there is a device which can be used for us to travel to another dimension,is there any explanation to this nachikethagni???