[Naufal the B. S. (OP)]

According to e=mc(2)

[Naufal the B. S. (OP)]

Why an uranium can make a very big fire(and radiation)?
Whereas, uranium is a metal

[Bored chemist]

A plane could never get to the speed of light.
If it got to about 10 times the speed of sound in normal air it would burn up. In a perfect vacuum it wouldn't need to worry about  frictional heating but you still couldn't get it to the speed of light.

Uranium can burn for the same reason that coal can. The reaction between uranium and oxygen gives out heat.
Many metals will burn in air. Magnesium is pretty well known for doing so.

[Naufal the B. S. (OP)]

Einstein said that any mass at the speed of light can produce a very big energy.
Assume that no air, and plane at the speed of light technology. What energy will plane get?
And, how about electron and ion?

[Bored chemist]

Einstein said nothing (apart fro m light) can get to the speed of light.

[Naufal the B. S. (OP)]

Whatever speed that can make uranium's atom "boom". Okey.
(thanks to boredchem, you gave me new knowledge)