🔮 The future of transport

Hydrogen fuel cell vehicles combine hydrogen gas with oxygen from the air inside a special device called a fuel cell, and that chemical reaction produces electricity directly, along with plain water as the only leftover byproduct. That electricity then powers an electric motor exactly the same way a battery would, but a hydrogen tank can often be refilled in just a few minutes, much faster than fully recharging a large battery. The biggest challenges facing hydrogen vehicles today are producing, storing, and transporting hydrogen safely and cheaply enough, since hydrogen gas takes up a lot of space and needs specialised equipment to handle.

A hyperloop is a proposed transport system that would send pods full of passengers or cargo through a sealed tube with most of the air removed, since less air means far less drag slowing the pod down at extremely high speeds. Powerful magnets would likely both push the pod forward and let it float slightly above the tube's surface, similar to maglev trains, removing wheel friction almost entirely from the equation. Building a real hyperloop would require enormous, incredibly precise tubes stretching for very long distances, all kept nearly airless and structurally strong enough to handle pods moving faster than most commercial airplanes, which is why full-scale hyperloops do not exist yet outside of test tracks.

Most current flying car concepts use multiple small electric rotors, similar to a drone, rather than traditional airplane wings, which lets them take off and land vertically without needing a long runway. Because flying adds enormous complexity compared to driving, from air traffic rules to battery weight to noise near neighbourhoods, most realistic near-future flying cars are being designed for short trips between specific landing pads rather than casual door-to-door travel everywhere. Engineers also have to solve extremely difficult safety questions, like what happens if a flying car has a problem while high above a crowded city, which is part of why flying cars remain mostly experimental today rather than common on the roads.

With current rocket technology, humans have travelled as far as the Moon, and unmanned robotic spacecraft have reached every planet in our solar system, but a crewed mission to even the nearest other star would take an incredibly long time using today's fastest engines. This is mainly because chemical rocket fuel, the kind used today, can only push a spacecraft to a limited top speed, nowhere near fast enough to cross the mind-bogglingly enormous distances between stars within a human lifetime. Scientists are researching entirely new kinds of engines, including ones powered by nuclear reactions or even light itself, hoping to eventually reach speeds fast enough to make journeys to nearby stars realistic for future generations.