Question

What is galaxy and star ​

Answer 1

Answer:

distinguish galaxies from stars, you can use the spectrum. Roughly, stars have a black-body like spectrum with features depending on the absorption and emission on the line of sight and in the chromosphere of the star. Galaxies on the other hand of a spectrum that is the composite of tons of stars.

Answer 2

Hello mate..

Question:

What is galaxy and star ?

Answer:

Galaxy:

1. Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity.
2. In a simple way, A galaxy is a vast island of stars in an ocean of space. There are billions of Galaxies including our own sun (in the Milky Way Galaxy).
3. And there are billions of galaxies in the universe.

Stars:

1. A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity.
2. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements.
3. The Sun is the closest star to Earth. The Sun belongs to a galaxy called the Milky Way.
4. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!

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