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Student : Miral Khaled teacher: Sohila school: Al Fayez international school

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what is a galaxy?

A  galaxy  is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. A supermassive black hole is the largest type of black hole, with mass on the order of millions to billions of times the mass of the Sun.

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How Many Galaxies Are There?

In 2018 100 billion galaxies All in all, Hubble reveals an estimated 100 billion galaxies in the universe or so, but this number now IN 2021 is 200 billion

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What is the name of our galaxy?

the Milky Way Galaxy Did you know that our star, the Sun, is just one of hundreds of billions of stars swirling within an enormous cosmic place called the Milky Way Galaxy? The Milky Way is a huge collection of stars, dust and gas.

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What Kinds of Galaxies Are There?

Elliptical galaxy

An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image .

Spiral galaxy

Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.

Irregular galaxy

An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure

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how long can galaxies last?

It will take somewhere between 10^80 and 10^100 years, depending on how massive our supermassive black hole gets, but even this, too, will go away. No matter how you define a  galaxy  or its remnants, all of them will most certainly die .

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Traveling at light speed, how long would it take to get to the nearest galaxy?

749,000,000 years To get to the closest galaxy to ours, it would take approximately 749,000,000 years to travel the distance of 25,000 light years! If we could travel at the speed of light, it would still take 25,000 years!

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What is the largest galaxy?

IC 1101 Located almost a billion light-years away, IC 1101 is the single largest galaxy that has ever been found in the observable universe. Just how large is it? At its largest point, this galaxy extends about 2 million light-years from its core, and it has a mass of about 100 trillion stars.

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What is the most distant known galaxy?

GN-z11 is currently the oldest and most distant known galaxy in the observable universe. GN-z11 has a spectroscopic redshift of z = 11.09, which corresponds to a proper distance of approximately 32 billion light-years (9.8 billion parsecs).

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Fun Facts about Galaxies

The closest galaxy to the Milky Way is Andromeda, which is around 2.6 million light years away from us. Many galaxies are more than 100,000 light years across in distance. It takes over two hundred million years for the sun to orbit the center of the galaxy. This is called a galactic year.

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Thank you for your attention