- Written by Super User
- Category: Galaxies
- Hits: 99
The universe is described as a collection of objects in the space. There are billions of different galaxies in the universe. Other than our Milky Way, only three such cosmic systems exist that can be seen without a telescope and show up as a fluffy fix in the sky.
Magellanic Clouds, Large and Small, are the nearest cosmic systems that we can see without a telescope. These satellite systems of the Milky Way can be seen from the southern side of the equator. Indeed, they are around one hundred and sixty thousand light-years from us. The Andromeda Galaxy is a bigger cosmic system that can be seen from the northern half of the globe with great visual perception and a dim sky. Though it is 2.5 million light-years from us, yet it is drawing nearer, and analysts foresee that in around four billion years, it will slam into the Milky Way. Different cosmic systems are significantly further from us and must be seen through telescopes only.
Most important galaxy, Milky Way
Cosmologists match those we find in other common winding systems to the measure of residue in the Milky Way and the overwhelming shades of the light we see.The majority of this signifies give us an image of the Milky Way, even though we can't get outside to see the entire thing.
Why do we think that the Milky Way is a spiral galaxy? There are a few hints which prove this assumption. The first hint originates from the brilliant band of stars that stretches over the sky. That band originates from seeing the circle of stars that structures the Milky Way from inside the circle and reveals to us that our cosmic system is essentially flat.A few unique telescopes have taken pictures of the circle of the Milky Way by taking a progression of pictures in various ways.
The convergence of stars in a band adds to the proof that the Milky Way is a winding galaxy and not an elliptical one. On the off chance that we lived in a curved universe, we would see the stars of our world spread out all around the sky, not in a solitary band.
Main Types of Galaxies
The littlest cosmic systems may contain just a couple of hundred thousand stars and be a few thousand light-years over, while the biggest universes have trillions of stars and perhaps, countless light-years over.Cosmic systems can be found without anyone else's input, in little gatherings, and enormous groups. It is extremely uncommon to discover stars in the space in the middle of cosmic systems.Galaxies, some of the time slam into one another, with intriguing outcomes. These crashes can trigger blasts of star-arrangement notwithstanding changing the states of the galaxies that impact. Be that as it may, when galaxy impacts happen, singular stars don't crash, because of the huge separations between them.
Elliptical, Spiral and Irregular galaxies have been the three main types of Galaxies. More than 66% of all noticed galaxies are spiral galaxies. Spiral Galaxies have three noticeable parts: a flimsy circle made out of stars, residue, and gas; a focal lump of more established stars and a round corona of the most seasoned stars and gigantic star bunches.
Elliptical galaxies are elliptical, as their name suggests. They are commonly round, however, can extend longer along one axis, to such an extent that some take up a stogie like appearance. The Elliptical galaxies can contain up to a trillion stars and length 2,000,000 light-years over. Elliptical systems may likewise be little, in which case they are called predominate elliptical galaxies.They contain tiny gas and residue. Hardly any new stars are known to shape in elliptical galaxies.
Galaxies that are not winding, lenticular or circular are called Irregular cosmic systems. Irregular galaxies often lack a definite shape because they are inside the gravitational impact of different galaxies close by. They are loaded with residue and gas. They are isolated into two groups, Irr I and IrrII. Irr II cosmic systems just appear to have a lot of residue that squares the vast majority of the light from the stars. This residue makes it practically difficult to see particular stars in the system.
Prior to the twentieth century, we didn't realize that cosmic systems, other than the Milky Way, existed. Earlier cosmologists had characterized them as "nebulae," since they looked like fluffy mists. However, during the 1920s, space expert, Edwin Hubble demonstrated that the Andromeda "cloud" was a system in its own right.
Lenticular cosmic systems, for example, the famous Sombrero Galaxy, sit among elliptical and spiral galaxies. They're designated "lenticular" because they look like lenses. Like winding galaxies, they have a dainty, pivoting plate of stars and a focal lump, yet they don't have winding arms. Like curved galaxies, they have little residue and appear to frame in thickly populated areas of space.
There are several galaxies that exist. Tadpole Galaxy, Black Eye Galaxy, Sombrero Galaxy, Whirlpool Galaxy, Cigar Galaxy, Cartwheel Galaxy, Sunflower Galaxy, Bode's Galaxy, Comet Galaxy, Cosmos Redshift 7 and Mayall's Object are some of the galaxies that have been discovered.
Page 3 of 3