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"it slowly dawned on me that the landscape of science is maybe what interests people a great deal in science fiction."
- Gregory Benford

Parallel Universe  
  An entirely separate realm or universe that exists along with our own; it may be wildly different or vary from ours by only a tiny degree.  

This is a very early instance of this term in sf; possibly a first reference.

We conceive ourselves to be living in a parallel universe to yours, on a planet the very brother of your own.
Technovelgy from Men Like Gods, by H.G. Wells.
Published by Macmillan in 1923
Additional resources -

The notion of a separate world, or plane of existence, or realm, has existed in the human imagination from time immemorial. The classical Greeks used the ideas of Mount Olympus and Hades' underworld as different realms that existed along with our own; the ancient Hindus used the idea of a multiplicity of realms called "lokas".

Wells also described this idea in 1896 in The Plattner Story:

To put the thing in technical language, the curious inversion of Plattner's right and left sides is proof that he has moved out of our space into what is called the Fourth Dimension, and that he has returned again to our world.

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Additional resources:
  More Ideas and Technology from Men Like Gods
  More Ideas and Technology by H.G. Wells
  Tech news articles related to Men Like Gods
  Tech news articles related to works by H.G. Wells

Parallel Universe-related news articles:
  - Have Scientists Found A Parallel Universe Leaking Into Ours

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Science Fiction in the News

SpaceX Wants A Moonbase Alpha
'And he had been sent with troops, supplies and bombs to command Russia's most trusted post, the Moonbase.'

Vast Apartment Living Will Get Even More Vast
'What is your population', I asked. 'About eighty millions.'

NASA Wants Self-Driving Or Remote-Controlled Vehicles For Lunar Astronauts
'THE autobus turned silently down the wide street of Hydropole. Robot-guided, insulated from noise and cold...'

Elon Musk Says Robotaxis Will Be Ready This August, 2024
'The car had no steering wheel, and no one drove!'

Moonwalkers AI-Controlled Electric Shoes
Now that's power walking that Hugo Gernsback would have approved.

Steve Jobs: 'Capture The Next Aristotle - With AI'
'It was disturbing to think of the Flatline as a construct...'

No Tips! Robotic Food Delivery In Phoenix
'...he rewired the delivery robot so that it would serve him midnight snacks.'

Electric Catamaran 'Explorer Eco 40m' Has 'Solar Skin'
'On went the electric-yacht faster and still faster.'

Orbital Mechanics, The Liftoff, The Turnover, The Retrograde Burn
'...the huge vessel had spun, with a sickening lurch, through a complete half-circle, the instant the power was reversed.'

Harvest Power From Tears And Blinking With Smart Contact Lens
'...he realized that it was not quite a clear lens. Speckles of colored brightness swirled and gathered in it.'

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