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Many hypothetical technologies have been the subject of science fiction. The criteria for this list are that the technology: Must not exist yet; Is credibly proposed to exist in the future (e.g. no perpetual motion machines) If the technology does not have an existing article (i.e. it is "redlinked"), a reference must be provided for it
Whole brain emulation (WBE) or mind uploading (sometimes called mind copying or mind transfer) is the hypothetical process of copying mental content (including long-term memory and "self") from a particular brain substrate and copying it to a computational or storage device, such as a digital, analog, quantum-based, or software-based artificial neural network.
Glueball, hypothetical particle that consist of only gluons. Quark bound states beyond the pentaquark, like hexaquarks and heptaquarks. Leptoquark, hypothetical particles that are neither bosons or fermions but carry lepton and baryon numbers. Magnetic monopole is a generic name for particles with non-zero magnetic charge. They are predicted by ...
Hypothetical technologies are distinct from emerging technologies, which are new actual technologies, or developing technological fields presenting useful advances. As there is often only a thin line between fiction and hypothesis, this category may have considerable overlap with fictional technology. Hypothetical technologies listed here ...
A hypothetical Solar System object is a planet, natural satellite, subsatellite or similar body in the Solar System whose existence is not known, but has been inferred from observational scientific evidence. Over the years a number of hypothetical planets have been proposed, and many have been disproved.
Hypothetical alternatives to water include ammonia, which, like water, is a polar molecule, and cosmically abundant; and non-polar hydrocarbon solvents such as methane and ethane, which are known to exist in liquid form on the surface of Titan.
The adjective hypothetical, meaning "having the nature of a hypothesis", or "being assumed to exist as an immediate consequence of a hypothesis", can refer to any of these meanings of the term "hypothesis".
Hypothetical astronomical objects have been speculated to exist both inside and outside of the Solar System, and speculation has included different kinds of stars, planets, and other astronomical objects. For hypothetical astronomical objects in the Solar System, see: List of hypothetical Solar System objects