What is a Star?
A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth. For example:Polaris,Sirius,Alpha CentauriSystem,Betelgeuse,Rigel,Vega,Pleiades,Antares.
What is a Planet?
A Planet as an object that:
- orbits the sun
- has sufficient mass to be round, or nearly round
- is not a satellite (moon) of another object
- has removed debris and small objects from the area around its orbit.
For example Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Differences Between Stars and Planets are:
|Stars are celestial bodies made up of gases; they are huge in size and have very high temperatures.||Planets are the celestial bodies that do not have their own heat and light.|
|Stars consist of matter like Hydrogen, Helium, and other light elements.||Planets, on the other hand, contain solids, liquids, gases, or a combination thereon.|
|The stars change their position, but can be seen only after a long time due to substantial distance.||Planets in orbits on their own axis change their positions constantly.|
|They have their own heat and light, which they emit in large amounts.||They are lit by the light of stars.|
|For example, the Sun is a star.||For example, the Earth on which we live is a planet.|
We can easily conclude the main difference between Stars and Planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—usually, they burn hydrogen in their cores, releasing massive amounts of energy. To be hot enough for these reactions to take place, stars need to be extremely big. They must have a mass of at least 75 times that of Jupiter, the largest planet in the Solar system. Because they radiate energy, stars are very bright objects. Planets do not generate their own energy through nuclear reactions. They reflect some of the radiation coming from their parent star.