Why do disk stars bob up and down?

Why do orbits of bulge stars bob up and down? They’re stuck to the interstellar medium. Gravity of disk stars pulls toward disk. Halo stars knock them back into disk.

How would you expect a star that formed recently in the disk of the Milky Way galaxy to differ from one that formed early in the history of the disk?

How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk? It should have a higher fraction of elements heavier than hydrogen and helium.

Why do disk stars bob up and down as they orbit the galaxy?

Why do orbits of bulge stars bob up and down? They’re stuck to the interstellar medium. Gravity of disk stars pulls toward disk. Halo stars knock them back into disk.

How do we determine the Milky Way is mass outside the suns orbit?

The Sun revolves completely around the galactic center in about 225 million years (a galactic year). The mass of the Galaxy can be determined by measuring the orbital velocities of stars and interstellar matter.

What do halo stars do differently from disk stars?

What do halo stars do differently from disk stars? They orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane.

How do halo stars differ from disk stars quizlet?

What do halo stars do differently from disk stars? They orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane.

How do the stars in the disk of the galaxy differ from the ones in the bulge and halo?

The explanation for the marked difference in stellar content between disk and halo is this: whereas the gas-rich Galactic disk is the site of ongoing star formation and so contains stars of all ages, all the stars in the Galactic halo are old.

What distinguishes the different stellar populations in our galaxy?

We now know that the populations differ not only in their locations in the Galaxy, but also in their chemical composition, age, and orbital motions around the center of the Galaxy.

What is the difference between the stars at the center bulge and the stars in the arms?

The bulge has a large concentration of stars. The arms and bulge are surrounded by a faint halo of stars. The bulge and halo consist mainly of older stars, where spiral arms have more gas, dust and younger stars.

In which type of galaxy would you be most likely to find a stellar population most similar to that found in globular clusters?

Globular clusters are found in nearly all galaxies. In spiral galaxies like the Milky Way, they are mostly found in the outer, spheroidal part of the galaxy—the galactic halo.

What type of galaxy is the most common?

Elliptical galaxies

Elliptical 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.

What is the very strong source of radio waves at the center of our galaxy is called?

Sagittarius A*, supermassive black hole at the centre of the Milky Way Galaxy, located in the constellation Sagittarius. It is a strong source of radio waves and is embedded in the larger Sagittarius A complex.

Which of these galaxies is most likely to be oldest?

12 Cards in this Set

Which of the following types of galaxies is the most common type of galaxy found in large clusters quizlet?

Elliptical: The “giant” variety is the most massive type of galaxy and is often found in the centers of large galaxy clusters.

What is the diameter of the disk of the Milky Way?

Terms in this set (8) What is the diameter of the disk of the Milky Way Galaxy? The thickness? The diameter is 100,000 light years and the thickness is 1,000 light years.

What is antimatter quizlet?

What is Antimatter? Antimatter is a molecules formed by atoms that consists of the same things that matter has, but the exact opposite. Antimatter is basically the same as matter, but qualities such as electric charge are opposite.

What do we mean when we say that the rotation curve for the Milky Way galaxy is flat?

The flat part of the Milky Way Galaxy’s rotation curve tells us that stars in the outskirts of the galaxy: orbit the galactic center just as fast as stars closer to the center.

What is antimatter astronomy quizlet?

Antimatter-antimatter annihilation. An event that occurs when a particle of matter and a particle of antimatter meet and convert all their mass-energy to photons.