Light is in the electromagnetic spectrum. This is the same spectrum that contains radio, microwaves, infrared etc. Light travels as a wave in quantized packets called "photons". This has been confirmed by simple experiments that show that it is not in fact a particle and that they travel as photons.

Megaton is larger. In metric units a ton is 1000 kilograms. A kiloton is then 1000 tons and a megaton is 1,000,000 tons. So megaton is larger by a factor of 1000.

There are three subatomic particles. These are the Neutron, Proton and Electron. The Neutron carries no charge, but the Proton carries a positive charge. These two particles clump together at the centre of the atom and are orbited by the negatively charged electron. Electron are located at various different orbits that are at differing distances … Read more

It depends which you mean. An atomic bomb is often characterised as a single fission bomb (atomic generally referring to a fission bomb and hydrogen to bomb working on the principle of fusion), whereas nuclear warheads often have many separate bombs contained in the same housing. This enabled one warhead to cover a large area … Read more

Another way that satellites can be power is by a "radioisotope thermoelectric generator" (RTG). These work on turning the heat from a decaying source into electrical power. They are not commonly used for satellites that orbit, but have been used in the past for satellites that operate at a distance from the sun where solar … Read more

To stay in orbit around the earth you need to be resisting the pull of gravity pulling you downwards. To do this you must be going at a certain speed determined by this height. This speed gets higher the closer you want to orbit and slower the further out you want to orbit. A stationary … Read more