What are stars and galaxy?


What are stars and galaxy?

A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. We live on a planet called Earth that is part of our solar system. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity.

What are 5 interesting facts about galaxies?

Galaxy Facts: Interesting Facts about Near and Distant Galaxies

  • Galaxies can range in size from a dwarf with as few as ten million stars to massive giant galaxies with a hundred trillion stars.
  • There are over 170 billion galaxies in the observable universe yet there is also a “future visibility limit”.

What are 3 interesting facts about galaxies?

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.

How stars and galaxies are related?

Compared to stars, galaxies are relatively close to one another. They interact and even collide. When galaxies collide, they pass through each other; their stars don’t crash into each other because of the immense distances between them.

How many stars are in a galaxy?

100 billion stars
An incredible number. Red, white and blue stars give off different amounts of light. By measuring that starlight – specifically, its color and brightness – astronomers can estimate how many stars our galaxy holds. With that method, they discovered the Milky Way has about 100 billion stars – 100,000,000,000.

How do stars work?

It lives in the Milky Way Galaxy, along with approximately 400 billion other stars. They all work by the same basic principle: they fuse atoms in their cores to make heat and light. It’s how a star works. For the Sun, this means that atoms of hydrogen are slammed together under high heat and pressure.

What holds galaxies together?

What holds galaxies together? Gravity. All of the stars of a galaxy are all attracted to each other. This attraction is weak because the stars are very far apart, but it is enough to keep the galaxies together.

Do stars move?

The stars are not fixed, but are constantly moving. If you factor out the daily arcing motion of the stars across the sky due to the earth’s rotation, you end up with a pattern of stars that seems to never change.