What is the shape of spiral galaxy?
Galaxy classification Perhaps the most familiar kind of galaxy are spiral galaxies. They have a distinctive shape with spiral arms in a relatively flat disk and a central “bulge”. The bulge has a large concentration of stars. The arms and bulge are surrounded by a faint halo of stars.
What is the size and structure of the Milky Way galaxy?
Structure and Composition. The galaxy we live in, called the Milky Way Galaxy, is a barred spiral galaxy composed of at least 100 billion stars. It is approximately 100,000 light years across and about 1000 light years thick. It has a central bulge that is about 10,000 light years in diameter.
Which statement describes the structure of the Milky Way galaxy?
Answer: A core with spiral arms. Explanation: A collection of the stars, gases and dust is known as a galaxy.
How is a supermassive black hole formed?
One possible mechanism for the formation of supermassive black holes involves a chain reaction of collisions of stars in compact star clusters that results in the buildup of extremely massive stars, which then collapse to form intermediate-mass black holes.
What are the 4 types of galaxies?
In 1936, Hubble debuted a way to classify galaxies, grouping them into four main types: spiral galaxies, lenticular galaxies, elliptical galaxies, and irregular galaxies.
What shape is an irregular galaxy?
Irregular galaxies have no particular shape. They are among the smallest galaxies and are full of gas and dust. Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them.
What is the structure of the Milky Way?
This structure can be viewed as consisting of six separate parts: (1) a nucleus, (2) a central bulge, (3) a disk (both a thin and a thick disk), (4) spiral arms, (5) a spherical component, and (6) a massive halo. Some of these components blend into each other. Three views of the Milky Way Galaxy.
What are the three main components of the structure for the Milky Way galaxy?
Visible Components A spiral galaxy like the Milky Way has three basic components to its visible matter: the disk (containing the spiral arms), the halo, and the nucleus or central bulge.
Could our Sun become a black hole?
However, the Sun will never turn into a black hole, because it is said to have less mass than needed to turn into one. When the Sun is about to reach its end and run out of its fuel, it will automatically throw off outer layers turning into a glowing gas ring known as a “planetary nebula”.
How does galaxy look like?
A spiral galaxy has a flat, spinning disk with a central bulge surrounded by spiral arms. Elliptical galaxies contain many older stars, but little dust and other interstellar matter. Their stars orbit the galactic center, like those in the disks of spiral galaxies, but they do so in more random directions.
How old is an irregular galaxy?
Irregular galaxies are known for the strange shape they take, as they have no central bulge or spiral. Irregular galaxies are on average, some of the youngest in our universe. They’re typically between 4 and 8 billion years old, whereas other galaxies are as old as 12 billion years old.
How is the structure of the Milky Way galaxy described?
Structure of the spiral system. The Milky Way Galaxy’s structure is fairly typical of a large spiral system. (Spiral galaxies and other types of galaxies are described in the article galaxy .) This structure can be viewed as consisting of six separate parts: (1) a nucleus, (2) a central bulge, (3) a disk (both a thin and a thick disk),
How big is the black hole in the Milky Way?
However, you must keep in mind that this object is found in the central ~100 AU of a galaxy that is something like 30 kiloparsecs or more in radius, so in every image you have seen so far of the Milky Way Galaxy, Sgr A* would be much smaller than the single pixel in the center of the image.
What makes up the structure of a black hole?
Structure of a black hole There are two basic parts to a black hole: the singularity and the event horizon. The event horizon is the “point of no return” around the black hole. It is not a physical surface, but a sphere surrounding the black hole that marks where the escape velocity is equal to the speed of light.
Can you see the band of the Milky Way galaxy?
The band of the Milky Way galaxy can be seen at night in areas with dark skies. Here it is seen with several Atacama Large Millimeter/submillimeter Arra (ALMA) antenna. (Credit: ESO/B. Tafreshi. Our Sun (a star) and all the planets around it are part of a galaxy known as the Milky Way Galaxy.
