The celestial bodies which have their own heat and light, are called as :

Question

Accepted Answer

The correct option is 2:

A star is defined as a massive, luminous sphere of plasma held together by its own gravity, primarily consisting of hydrogen and helium. The crucial characteristic that distinguishes stars is their ability to generate their own heat and light through a process called nuclear fusion, which occurs in their core. During nuclear fusion, hydrogen atoms combine to form helium, releasing enormous amounts of energy. Our Sun is a perfect example, as it is the closest star to Earth and the ultimate source of heat and light for our solar system. Therefore, any celestial body that independently produces and radiates its own energy in the form of light and heat is accurately classified as a star.

The incorrect option is 1:
Planets, such as Earth, Mars, and Jupiter, are large celestial bodies that orbit a star (like the Sun). However, they do not possess their own source of heat and light. Instead, planets reflect the light they receive from the star they orbit, which is why we can see them. They primarily generate internal heat from residual accretion energy and radioactive decay, but this heat is negligible compared to the energy output of a star and does not qualify as "their own heat and light" in this astronomical context.

The incorrect option is 3:
Satellites are celestial bodies that orbit a planet or a minor planet. They can be natural (like the Moon orbiting the Earth) or man-made. Like planets, satellites are opaque and do not produce their own light or heat through nuclear processes. The light and heat they exhibit are entirely derived from the reflection of starlight (sunlight, in our solar system) or by emitting infrared radiation due to the absorption of this light.

The incorrect option is 4:
This option is incorrect because, as explained above, only stars possess the ability to generate their own heat and light through nuclear fusion. Planets and satellites reflect light but do not produce it, making the generalization that "All options are right" factually inaccurate in astronomy.