In the twenty-second century Earth obtains limitless, free energy from a source science little understands: an exchange between Earth and a parallel universe, using a process devised by the aliens. But even free energy has a price. The transference process itself will eventually lead to the destruction of the Earth's Sun—and of Earth itself.
Only a few know the terrifying truth—an outcast Earth scientist, a rebellious alien inhabitant of a dying planet, a lunar-born human intuitionist who senses the imminent annihilation of the Sun. They know the truth—but who will listen? They have foreseen the cost of abundant energy—but who will believe? These few beings, human and alien, hold the key to Earth's survival.
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Science fiction at its best
Dare I say—I don’t always like Asimov’s books. But this one! Could anyone else make atomic physics dramatic? Combine that with the suspense of the imminent end of not one but two universes, and fully developed, sympathetic characters from Earth, the Moon, and from another universe. Needless to say, I loved it!
100 Words or Less
During the first part of this novel, I realized just how much science Asimov was cramming into his science-fiction. The characters and plot took the time to detail the scientific basis of their world. That doesn’t happen much anymore, and I was really intrigued.
Then I hit the 2nd part. The novel suddenly becomes bogged down in alien social networking and a seemingly endless string of dialogues about conforming to expectations. This new mode went on and on and on.
I finally had to stop reading.
The Aliens Are Coming!
This was one of the first alien invasion stories I've read. I love how Asimov delved into the aliens' society and thought processes. They were so much more superior than humans, hence the title.