Planets in orbits spin on their own axis and change their positions constantly. Stars consist of matter like Hydrogen, Helium, and other light elements. Planets, on the other hand, contain solids, liquids, gases, or a combination thereof. Thus, this is the basic difference between stars and planets.

Introduction:
A planet and a star are two distinct celestial objects that exist in the vastness of space. While they may appear similar from a distance, they have fundamental differences that set them apart. In this guide, we will explore these differences in detail.

What is a Planet?
- A planet is a celestial body that orbits around a star, such as our Sun.
- It is much smaller in size compared to a star and does not emit its own light.
- Planets are made up of various materials, including rock, ice, and gas.
- They have a solid surface and an atmosphere, which may vary in composition.
- Planets can have natural satellites, also known as moons, that orbit around them.

What is a Star?
- A star is a luminous celestial object that is made up of hot gases, primarily hydrogen and helium.
- Stars are much larger in size compared to planets and emit their own light and heat.
- They generate energy through a process called nuclear fusion, where hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process.
- Stars exist in various sizes and colors, ranging from small red dwarfs to massive blue giants.
- They can be grouped together in galaxies, forming beautiful constellations.

Differences between Planets and Stars:
1. Size and Mass:
- Planets are significantly smaller and less massive compared to stars.
- Stars can be thousands or even millions of times larger than planets.

2. Composition:
- Planets are composed of various materials, including rock, ice, and gas.
- Stars are primarily composed of hot gases, predominantly hydrogen and helium.

3. Light and Heat:
- Planets do not emit their own light and heat but reflect the light from their parent star.
- Stars generate their own light and heat through nuclear fusion.

4. Orbital Movement:
- Planets orbit around a star in elliptical paths.
- Stars do not orbit around anything but may be part of a larger stellar system within a galaxy.

5. Atmosphere:
- Planets have an atmosphere, which varies in composition and density.
- Stars have an outer layer known as the photosphere, which emits light and heat.

6. Formation:
- Planets are formed through the accumulation of dust and gas in a protoplanetary disk around a young star.
- Stars are formed from the gravitational collapse of large clouds of gas and dust, called nebulae.

Conclusion:
In conclusion, while both planets and stars are celestial objects found in space, they have several distinct differences. Planets are smaller, do not emit their own light, and are composed of various materials. On the other hand, stars are much larger, emit their own light and heat, and are primarily composed of hot gases. Understanding these differences helps us appreciate the vastness and diversity of our universe.