differentiate between stars and planets
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Early astronomers were able to tell thedifference between planets and starsbecause planets in our Solar System appear to move in complicated paths across the sky, but stars don't. That is, if you observe the sky night after night, the stars will all appear in fixed positions with respect to each other.
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The main difference between stars and planets is that stars have high temperatures compared to planets.
Stars undergo nuclear reactions—they burn hydrogen in their cores, releasing massive amounts of energy.
In order 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.
Stars undergo nuclear reactions—they burn hydrogen in their cores, releasing massive amounts of energy.
In order 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.
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