because transistor is not too hot while vacuum tubes are very easily to get hot
Yes, a rocket is a human-made invention that uses propulsion to propel itself through space by expelling mass in the opposite direction. It was developed to travel outside Earth's atmosphere for various purposes, including exploration, communication, and satellite deployment.
Yes.
You had better travel near the speed of light or you will not see much of the universe. Unfortunately travelling near the speed is not yet possible, so you are out of luck.
Some, but not all. Some materials are insulators- heat does not travel well through them.
Not that we know of. There are likely to be serious problems associated with time travel. Such as paradoxes. If a "time travel box" had been developed, it is probable that a future civilization would have travelled back in time to eliminate its invention and these paradoxes. [Which poses its own problems for the traveller!] I rather like the definition of time attributed to Ray Cummings in 1922; "Time is that which prevents everything from happening at once."
a car idiots!
The invention of the Portuguese ship, the caravel, made travel across the open tropical ocean and against the wind possible in 1492.
No, it is not possible to obtain a patent for a device that enables time travel as time travel is currently considered a theoretical concept and not a practical invention.
yes, they can travel.
Yes of course it is possible to do so.
No. Technically it is not possible.
There is currently no know and confirmed way to travel in time.
No, they do not go that deep
wheels
The Greek invention that aided navel travel and that was improved upon by the Muslims was Greek fire.
Techincally, it is possible, but only because we haven't proven it impossible, either.
To go from one continent to another, humans had to travel by foot or by horse. Unless, of course, there was water in between. The invention of ships made it possible to go between continents.