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Galaxy and stars, Its color depends on the temperature of its outer layers…
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Its color depends on the temperature of its outer layers: the colder a star is, the redder it looks. Instead, the hottest stars are blue.
Stars are born in clouds of dust and gas that are within galaxies. These clouds are specifically nebulae.
As that happens, the center of the nebula becomes denser and hotter until it begins to glow.
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Galaxies are collections of stars, planets, energy, and cosmic material bound together by gravitational forces.
Each galaxy contains a number of stars, interstellar clouds, planets, and various clusters.
galaxies get too close and collide with each other. Our Milky Way will one day collide with Andromeda
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Spiral galaxies: they look like gigantic pinwheels. The arms of the grinder are made up of stars and lots of gas and dust.
Elliptical galaxies: are shaped like stretched circles or ellipses. Some elliptical galaxies are more stretched out than others.
Irregular galaxies: are just that: irregular. They do not have a single common shape. Irregular galaxies are among the smallest galaxies that scientists have observed.
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What is a Galaxy ?
are accumulations of gas, dust, and billions of stars and their solar systems, grouped together by gravity.
What is stars?
They are composed almost entirely of gas and plasma, a superheated state of matter made up of subatomic particles.*
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Who discovered the galaxies and in what year?
On December 30, 1923, the astronomer Edwin Hubble discovered the individual stars that make up the nebula in the outer region of the Andromeda galaxy.*
How was the discovery of the stars?
William Herschel and stellar astronomy. Around 1773, Herschel built a telescope and began his research work. It started with the observation of double stars in search of their parallax,
