1. what is comet?Why does a comet develop a tail while approaching the sun?
2. what is star? What makes the star give about vast amount of energy?
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Answers
Explanation:
1) When far from the sun, a comet is like a stone rolling around the universe. But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
2) The nuclear fusion inside the core of star produces vast amount of energy. Nuclear burning (reaction) is much different from burning of simple hydrocarbons (coal, petrol, etc) where small amount of energy is produced. The Hydrogen gas or Helium is burnt as a nuclear fuel inside the star to produce energy.
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Answer:
(1) A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail.
When far from the sun, a comet is like a stone rolling around the universe. But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
(2) A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. ... For most of its active life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space.
The nuclear fusion inside the core of star produces vast amount of energy. Nuclear burning (reaction) is much different from burning of simple hydrocarbons (coal, petrol, etc) where small amount of energy is produced. The Hydrogen gas or Helium is burnt as a nuclear fuel inside the star to produce energy.
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