How the Sun is burning in space without oxygen?
The Sun is able to burn in space despite the absence of oxygen because the process of burning in the Sun is different from the combustion that occurs on Earth. The Sun's energy is generated through a process called nuclear fusion, which does not require oxygen to sustain the reaction.

Nuclear Fusion in the Sun
Nuclear fusion is the process by which the Sun produces energy. In the core of the Sun, hydrogen atoms are fused together to form helium, releasing a tremendous amount of energy in the process. This process occurs at extremely high temperatures and pressures, creating the conditions necessary for nuclear fusion to take place.

No Need for Oxygen
Unlike combustion, which requires oxygen as a reactant, nuclear fusion in the Sun does not rely on oxygen or any other external element to sustain the reaction. Instead, the fusion of hydrogen atoms into helium releases energy through the conversion of mass into energy, as described by Einstein's famous equation E=mc^2.

The Role of Gravity
The Sun's immense gravitational force is what keeps the nuclear fusion process going. The force of gravity compresses the core of the Sun, increasing the temperature and pressure to the levels required for nuclear fusion to occur. This gravitational pressure counteracts the tendency of the fusion reaction to expand, allowing it to continue burning steadily.
In conclusion, the Sun is able to burn in space without oxygen because it undergoes nuclear fusion, a process that does not rely on oxygen to sustain the reaction. Instead, the fusion of hydrogen atoms into helium releases energy through the conversion of mass into energy, facilitated by the Sun's intense gravitational force.