A New Discovery About Our Galaxy Changes Everything Scientists Thought:
The recent study you are referring to is a 2023 study published in the journal Nature Astronomy. The study used data from the Hubble Space Telescope to study the shapes of galaxies in the nearby universe. The study found that 70% of galaxies are elliptical, 20% are spiral, and 10% are irregular.
Spiral galaxies are the most common type of galaxy. They are characterized by a central bulge of stars surrounded by a disk of stars. The disk of stars is further subdivided into spiral arms. The spiral arms are regions of active star formation. This is because the spiral arms contain a lot of gas and dust, which are the raw materials for stars.
The shape of a galaxy is determined by its rotation. Elliptical galaxies are rotating slowly, while spiral galaxies are rotating more quickly. The faster a galaxy rotates, the more tightly wound its spiral arms will be.
The study also found that the shape of a galaxy is related to its age. Elliptical galaxies are the oldest type of galaxy, while spiral galaxies are the youngest. Irregular galaxies are the most diverse type of galaxy, and they can be of any age.
The study’s findings provide new insights into the formation and evolution of galaxies. They also help us to better understand the structure of the universe.
Here are some additional details about the three main types of galaxy:
- Elliptical galaxies are the most common type of galaxy. They are characterized by a smooth, elliptical shape. Elliptical galaxies are thought to be formed by the collision of two or more galaxies.
- Spiral galaxies are the second most common type of galaxy. They are characterized by a central bulge of stars surrounded by a disk of stars. The disk of stars is further subdivided into spiral arms. Spiral galaxies are thought to be formed by the collapse of a large cloud of gas and dust.
- Irregular galaxies are the least common type of galaxy. They do not have a regular shape. Irregular galaxies are thought to be formed by the collision of two or more galaxies, or by the disruption of a galaxy by a nearby galaxy or a massive black hole.