Top 10 Science Fiction Ideas and Proposals

Science is 90% trial and error, and the following are thought-provoking ideas that warrant consideration by authors and scientists as plausible. It's actually quite common for ideas to be in circulation for a long time before they're picked up and carried out.
The Top Ten
1 A device that, using the law that causes anyone looking thousands of light years away to be looking thousands of years into the past, allows you to look into the past of your present location
2 Skyscrapers filled with trees that grow from the sides of the building and increase the amount of space trees have to grow in a certain area
3 A nuclear powered engine strapped to the Earth that would allow humans to drive around the galaxy without the need for spaceships that accommodate to human needs
4 A learning robot, designed to be able to detect all patterns in all modes of communication, which would allow it to serve as a universal translator through exposure
5 Heating machines that can take over for the sun by siphoning heat from the core of the Earth
6 A gun conveniently designed to use shards of glass as ammunition, shards of glass being both abundant and painful
7 A genetically engineered parasite that can be used as a lie detector when injected into someone who is then asked questions, producing symptoms that cue lies
8 City-sized terrariums, placed in the atmospheres of Venus, that would allow us to live in floating cities, since oxygen floats on Venus
9 Glass domes built along beaches, so that when climate change is complete and the sea levels have risen, we haveĀ  underwater sanctuaries
10 A metal ring, thin enough to walk around but large enough to be built around the sun, which can provide it with everlasting life while harboring temperate human habitation
The Contenders
11 A city built millions of years in the future, after mankind has invented time travel and entered into an alternate version of space from where they could jump anywhere in the timeline, and then destroying the universe by messing things up at its formation
12 An alien race which views pain, self harm, and most of all death as positive, all of which give them pleasure, but out of a sense of honor make it their mission to share their gift of pain and death with the universe, going from planet to planet.
13 A government army disguised as an alien invasion for the purpose of uniting the UN into one country and ruling over it
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