What is the major difference between an elliptical galaxy and a spiral galaxy quizlet?
The major difference between spiral and elliptical galaxies is that elliptical galaxies lack a significant disk component, although both types have the halo component.
Is this a photo of a spiral galaxy or an elliptical galaxy and how do you know?
Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know? It is a spiral galaxy, because we can see a dusty disk going across the center. This photo shows the Large Magellanic Cloud, or LMC for short.
What does an elliptical galaxy contain quizlet?
Elliptical galaxies contain mostly old stars and few new stars form because there is so little free-flowing gas in an elliptical galaxy.
Which of the following are likely to play a role in determining whether a galaxy spiral or elliptical?
Which of the following are likely to play a role in determining whether a galaxy is spiral or elliptical? – the rotation rate of the protogalactic cloud from which the galaxy was born.
How are spiral galaxies and elliptical galaxies different?
Spiral galaxies have a flat disk like shape and a bulging center with spiral arms consisting the disk. Elliptical galaxies are ellipsoids with no clearly visible internal structure. Spiral galaxies have a very dense nucleus and a region of stars bulging outwards from the disks and, therefore, called the central bulge.
What are the similarities between spiral and elliptical galaxies?
As their name suggests, elliptical galaxies are round or oval, with stars distributed fairly uniformly throughout. They have a bulge and halo, like spiral galaxies, but don't have the flat disk of stars. The stars in ellipticals tend to be older. Irregular galaxies have no identifiable shape or structure to them.
What is found in 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 features of irregular galaxies are also common to both spiral and elliptical galaxies?
Astronomers classify galaxies in three main categories – elliptical, spiral and irregular – with spiral and elliptical galaxies being those most observed to date. Both types of galaxy possess halos extending beyond their visible portions and both are thought to contain a supermassive black hole at their centre.
What makes 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.
Which of the following types of Protogalactic clouds is most likely to form an elliptical galaxy?
3) A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy than a spiral galaxy.
Which of the following statement about the irregular galaxy is true?
True: In general, elliptical galaxies contain very little cool gas. Which of the following statements are TRUE about irregular galaxies? True: Irregular galaxies often appear white and blue, indicating that they contain hot, massive young stars.
What are spiral elliptical and irregular galaxies?
A spiral galaxy consists of a spinning, flattened disk with arms that rotates very fast. An elliptical galaxy is the most common type of galaxy, has a roundish shape, and demonstrates little or no star formation. An irregular galaxy is a galaxy with no defined shape that has very young stars.
What do spiral elliptical and irregular galaxies have in common?
Astronomers classify galaxies in three main categories – elliptical, spiral and irregular – with spiral and elliptical galaxies being those most observed to date. Both types of galaxy possess halos extending beyond their visible portions and both are thought to contain a supermassive black hole at their centre.
What holds an irregular galaxy together?
Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble's keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters.
How is an irregular galaxy like a spiral galaxy?
They have a bulge and halo, like spiral galaxies, but don't have the flat disk of stars. The stars in ellipticals tend to be older. Irregular galaxies have no identifiable shape or structure to them. They are often chaotic in appearance, without a bulge or any trace of spiral arms.
What do elliptical and irregular galaxies have in common?
Both types of galaxy possess halos extending beyond their visible portions and both are thought to contain a supermassive black hole at their centre. Beyond shape, spiral and elliptical galaxies differ in terms of the age of their stars, their motion and physical make-up.
How are spiral galaxies and elliptical galaxies similar?
Spiral and elliptical galaxies are both sprawling astronomical systems containing stars, dust, gas and dark matter, surrounded by a similarly composed galactic halo. Stars in both galaxy types orbit around a galactic centre, which is thought to hold a supermassive black hole.
What are irregular galaxies held together by?
Galaxies are composed of stars, dust and dark matter, all held together by gravity.
How does the evolution of spiral galaxies differ from the evolution of elliptical galaxies?
How does the evolution of a spiral galaxy differ from that of an elliptical? The elliptical galaxy is formed from clouds of helium and hydrogen that stay in an irregular shape while spiral galaxies are formed from spinning clouds, hence the spiral shape.
How does the spiral galaxy differ from the irregular galaxy?
Elliptical galaxies are shaped like spheres or cucumbers and contain old stars. Spiral galaxies have a central disk surrounded by spiraling arms and possess new stars. Irregular galaxies have no distinct shape and have both old and new stars.
What holds a 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.
What is the difference between spiral elliptical and irregular galaxies?
As their name suggests, elliptical galaxies are round or oval, with stars distributed fairly uniformly throughout. They have a bulge and halo, like spiral galaxies, but don't have the flat disk of stars. The stars in ellipticals tend to be older. Irregular galaxies have no identifiable shape or structure to them.
How do irregular and elliptical galaxies form?
All galaxies began with an elliptical shape, which is mostly a result of the centrifugal force of the spinning gas cloud. Like pizza dough being spun into the air the gas cloud flattens to a thin disk shape. Only the small center of the galaxy retains a spherical shape do to its slow rate of rotation and density.
Is irregular a galaxy?
Irregular galaxies are the most unusual of galaxies. They don't seem to fit into either the spiral or elliptical galaxy categories. They don't have nice spiral arms, but they do have dark patches of gas and dust.
How might an irregular galaxy or an elliptical galaxy form from one or more spiral galaxies?
Collisions do distort a galaxy's shape and computer models show that collisions between spiral galaxies can eventually make ellipticals. Four billion years from now, our own Milky Way galaxy is destined for a collision with the neighboring spiral Andromeda galaxy.
What holds galaxies 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.
What holds space together?
Gravity is the force that all objects with mass exert upon one another, pulling the objects closer together. It causes a ball thrown into the air to fall to the earth, and the planets to orbit the sun. The tiny particles that make up matter, such as atoms and subatomic particles, also exert forces on one another.
What holds the 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.
What forces hold particles together?
There are four forces (Electromagnetic, Strong, Weak, and Gravity) that are responsible for the behavior of the particles and thus keep the atom together.
What holds the atoms together?
The atoms in most molecules are held together by strong attractive forces called chemical bonds. These bonds are formed through the interaction of valence electrons of the combining atoms.