The objects which emits (give us) light are known as luminous objects.ex-the sun,a torch.Luminous objects are again of 2types:1. Natural luminous objects-the sun,stars2.Man made luminous objects-torch,lamp

Luminous objects are those that emit their own light. They can produce visible light through various processes such as chemical reactions, nuclear reactions, or thermal radiation. These objects are the primary sources of light in our surroundings and are responsible for illuminating our environment. Here are five examples of natural luminous objects:

1. Stars:
- Stars are self-luminous celestial objects made up of hot gases, primarily hydrogen and helium.
- Nuclear fusion reactions occur within their cores, generating immense heat and light.
- The energy released during these reactions causes stars to shine brightly, making them visible from vast distances.
- Our nearest star, the Sun, is also a luminous object that provides heat and light to the Earth.

2. Fireflies:
- Fireflies are insects that produce their own light through a process called bioluminescence.
- They have specialized light-emitting organs in their abdomens that contain luciferase enzymes.
- These enzymes react with oxygen to produce light without generating heat, resulting in a cold light emission.
- Fireflies use their light as a means of communication, attracting mates, and deterring predators.

3. Volcanic eruptions:
- During volcanic eruptions, molten rock called magma is expelled from the Earth's interior onto the surface.
- Magma emits light due to its extremely high temperature, ranging from several hundred to several thousand degrees Celsius.
- The intense heat causes the magma to glow, producing a volcanic eruption's characteristic fiery glow.

4. Bioluminescent organisms:
- Various marine organisms such as plankton, jellyfish, and some fish possess the ability to emit light through bioluminescence.
- These organisms have light-producing chemicals within their bodies that react with oxygen to create light.
- Bioluminescence serves different purposes for different species, including attracting prey, confusing predators, or attracting mates.

5. Lightning:
- Lightning is a natural electrical discharge that occurs during thunderstorms.
- It is caused by the buildup of electric charges within clouds or between clouds and the ground.
- When the electric potential difference becomes too large, a rapid discharge occurs, resulting in a bright flash of light.
- The intense heat generated by the electrical current causes the surrounding air to rapidly expand and contract, producing the characteristic sound of thunder.

These natural luminous objects play crucial roles in our environment, providing illumination, aiding navigation, and even influencing various biological processes. Their ability to emit light allows us to observe and appreciate the beauty of the natural world.