What is a halo in a galaxy
Galactic halo, in astronomy, nearly spherical volume of thinly scattered stars, globular clusters of stars, and tenuous gas observed surrounding spiral galaxies, including the Milky Way—the galaxy in which the Earth is located..
How large is our galaxy in diameter
105,700 light yearsMilky Way/Diameter
What are the main components of a 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), (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 is the most common type of galaxy
Elliptical galaxiesElliptical galaxies are the most abundant type of galaxies found in the universe but because of their age and dim qualities, they’re frequently outshone by younger, brighter collections of stars. Elliptical galaxies lack the swirling arms of their more well-known siblings, spiral galaxies.
What shape is an irregular galaxy
An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure.
How many galaxies are they
Several thousand galaxies, each consisting of billions of stars, are in this small view. XDF (2012) view: Each light speck is a galaxy, some of which are as old as 13.2 billion years – the observable universe is estimated to contain 200 billion to two trillion galaxies.
Which is the most beautiful galaxy
The most beautiful galaxies in the universeGalaxy NGC 6753. … Large Magellanic Cloud. … Andromeda Galaxy. … Cigar Galaxy or Messier 82. … Molinete Galaxy. … Hat Galaxy. … Whirlpool Galaxy. … The Black Eye Galaxy.More items…
What is the force that holds galaxies together
gravityNational Aeronautics and Space Administration Most galaxies are not alone in the vast expanse of space, but are connected to one or more other galaxies by gravity. The same force that holds you onto the Earth can keep many individual galaxies bound together.
What is a component of all galaxies
What are the parts of a galaxy? A galaxy contains stars, gas and dust. In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a “bulge,” a “disk” containing “spiral arms,” and a “halo.” Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.
What galaxy do we live in
Milky Way GalaxyThe Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
How do we know we live in a spiral galaxy
1) When you look toward the Galactic Center with your eye, you see a long, thin strip. This suggests a disk seen edge-on, rather than a ellipsoid or another shape. We can also detect the bulge at the center. Since we see spiral galaxies which are disks with central bulges, this is a bit of a tipoff.
What holds the Milky Way galaxy together
Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark matter as all the stars and gas put together. And it’s all held together by gravity.
How many stars are in our galaxy
100 thousand million starsThe Sun belongs to a galaxy called the Milky Way. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone.
What are the 3 main components of a galaxy
The three major components of the Milky Way are referred to as the disk, bulge, and the halo. 2. The three types of active galaxies are Seyfert Galaxies, Radio Galaxies, and Quasars.
What are the four main components of a galaxy
From Earth, the Milky Way seems to be a heavenly mist because the stars blur together. Little do most people know, the stars are broken into four main parts. The four main parts are the disk, the nuclear bulge, the halo, and the galactic corona.
Who gave the name for the classification of galaxy
Edwin HubbleEdwin Hubble invented a classification of galaxies and grouped them into four classes: spirals, barred spirals, ellipticals and irregulars. He classified spiral and barred spiral galaxies further according to the size of their central bulge and the texture of their arms.
How old is our galaxy
13.51 billion yearsMilky Way/Age
What are the two primary components of a galaxy
A galaxy may be made up of two visible components. The two components are the disk and the bulge. Spiral galaxies have most of their stars in a disk.
What is the meaning of dark matter
Dark matter can refer to any substance which interacts predominantly via gravity with visible matter (e.g., stars and planets). Hence in principle it need not be composed of a new type of fundamental particle but could, at least in part, be made up of standard baryonic matter, such as protons or neutrons.
How is a galaxy classified
Galaxies are classified by shape. There are three general types: elliptical, spiral, and irregular. … Our Milky Way Galaxy is a spiral galaxy. Some spiral galaxies are what we call “barred spirals” because the central bulge looks elongated – like a bar.
Where is the bulge in the Milky Way galaxy
Our Milky Way galaxy is shaped like two fried eggs glued back-to-back. A central bulge of stars sits in the middle of a sprawling disk of stars.