Rockets designed for space travel use oxygen as part of their fuel systems because the oxygen aids the combustion by acting as an electron acceptor. Liquid oxygen may also be used in rocket fuel sometimes.
No. Jet engines draw oxygen from the atmosphere to mix and burn with jet fuel, and cannot function in a vacuum. Rockets carry their own oxygen, and can travel in the vacuum of space.
You give velocity to a satellite through rockets. The rockets use some powerful fuel - for example, a mix of hydrogen and oxygen - to push them into orbit.
electronic rockets
space
The purposes of rockets are to travel to space, to collect information and research.
Space travel is done by means of rockets.
They travel by rockets
You need rockets so you can travel to space and visit other planets. Without rockets we would know nothing about astronomy.
Of course. Rockets in general have existed for hundreds of years. Rockets which travel to outer space have existed since the 1950s.
Jet engines capture ambient oxygen to use as an oxidizer for their fuel. In a sense, an afterburner is somewhat like a rocket, but it still uses ambient oxygen for the oxidizer. Rockets are different. Since they are designed to travel out of the atmosphere, they must carry both their oxidizer and their fuel. Many hydrocarbons will work as a rocket fuel including petrol (gasoline), diesel, and even tar. But they must all also have oxygen as a second fuel for the oxidizer. Solid Rockets have both the oxidizer and fuel built into the same matrix, somewhat like gunpowder. The "Oxidizer" doesn't have to be oxygen, or even contain oxygen. Nitric Acid has been utilized as an oxidizer in some rocket engines.
air and water
By rockets