What is Star?
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A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but due to their immense distance from Earth they appear as fixed points of light in the sky. 

Explanation:

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Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth.

Explanation:

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answer:

3a+18

Explanation:

the reason why that is the answer is because you would do the distributive property of multiplication and the reason is because you would multiply 3(6) and 3(a) would be 3a