A galaxy is a conglomeration of billions that stars and interstellar matter hosted together by gravity. Every galaxy creates a glowing island lost in the enormous black sea the the universe. The is estimated that the universe has 100 billion galaxies and that each of them has an average of 100 exchange rate stars. Dwarf galaxies contain only a couple of million, while giant galaxies contain trillions. The diameter the galaxies varieties from around 3,000 to more than 500,000 light-years. Galaxies apparently created from diffuse clouds of gas and also primordial matter around two billion years after the large Bang.
Classification of the galaxies
In 1925, the astronomer Edwin Hubble draft a simple an approach for classifying galaxies. We are still utilizing this an approach today. He very first identified three main shapes: elliptical, spiral and also irregular galaxies. Later, he added a 4th one, the lenticular shape.
Characterizing around 60 percent of observed galaxies, the spiral is the most common shape. Spiral galaxies have actually curved, spiral-shaped eight on the political parties of your nucleus. They are classified Sa, Sb or Sc according to the size of your nucleus and also how strict the spiral arms are wound. The Milky Way, the galaxy whereby our solar system is located, is one Sb-type spiral galaxy. An approximated 20 percent of recognized galaxies have actually a lenticular form, 15 percent are elliptical and only about 5 percent are irregular.
You are watching: About 60 percent of all known galaxies are classified as
Classification that the galaxies
In 1925, the astronomer Edwin Hubble designed a simple an approach for classifying galaxies. We are still utilizing this technique today. He very first identified three key shapes: elliptical, spiral and irregular galaxies. Later, he included a fourth one, the lenticular shape.
Characterizing around 60 percent of it was observed galaxies, the spiral is the most usual shape. Spiral galaxies have actually curved, spiral-shaped eight on the political parties of your nucleus. They room classified Sa, Sb or Sc follow to the size of your nucleus and also how strict the spiral arms room wound. The Milky Way, the galaxy whereby our solar mechanism is located, is an Sb-type spiral galaxy. An estimated 20 percent of recognized galaxies have a lenticular form, 15 percent space elliptical and only about 5 percent room irregular.
Our Galaxy: the Milky Way
Seen from Earth, the Milky way forms a narrow, dim cloud crossing the nocturnal skies from one side to the other. The looks a tiny like a present of milk, which is what inspired the old Greeks to name it the Milky Way. The is daunting to determine the precise shape of our galaxy. The fact that we space within it way that us cannot view it in its entirety.
See more: Question: How Many Ounces Is 14 Grams To Ounces, 14 G To Oz 14 Grams To Ounces
Composed of end 100 exchange rate stars creating a huge disk through spiral arms, ours galaxy is around 10 billion year old. Together for ours solar system, it would be just 5 billion year old. It is situated on the perimeter of the Galaxy, in the Orion Arm. In the facility of the Milky way is a black hole, i beg your pardon results when the core of a enormous star collapses. The gravitational force is then so strong that not also light have the right to escape.