What happens after many generations of the star-gas-star cycle? hydrogen gas decreases.
They orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane. 6. How do we know that the halo stars are older, on average, than disk stars? A) We see evidence for new stars forming in the disk today.
Moreover, Are halo stars old?
The halo stars in the Milky Way are generally old, with most having ages greater than 12 billion years. These ages are similar to those of bulge and globular cluster stars, meaning that stars in the halo were probably among the first Galactic objects to form.
Secondly, Why do stars in the halo of the galaxy?
Clues come from the Milky Way’s oldest and wisest stars—those in the stellar halo, the galactic component that envelops the bright disk housing the sun. Halo stars stand out because they formed before supernova explosions had scattered a large amount of heavy elements into the galaxy, so halo stars possess little iron.
Simply so, Which galaxies have a halo?
In a landmark study, scientists using NASA’s Hubble Space Telescope have mapped the immense envelope of gas, called a halo, surrounding the Andromeda galaxy, our nearest large galactic neighbor.
Do stars form in the Halo?
The halo contains very old stars and globular clusters. Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.
27 Related Question Answers Found
How do halo stars differ from disk stars?
Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass and red. Clusters of young stars are found only in the disk. Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits.
What are the orbits of stars in our galaxy’s halo?
The stars in the halo are old, have low abundances of elements heavier than hydrogen and helium, and have highly elliptical orbits randomly oriented in direction (see Figure 1). Halo stars can plunge through the disk and central bulge, but they spend most of their time far above or below the plane of the Galaxy.
What are the coldest and densest collections of gas?
This is because the interstellar medium, or the space between the stars, contains enormous clouds of gas and dust, called nebulae. The coldest and densest of these nebulae block the light from stars within and behind these clouds. Figure 1 – The Milky Way.
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.
Why do orbits of bulge stars bob up and down?
Orbits of stars in the bulge have random orientations. The orbits of bulge stars bob up and down because gravity of disk stars pulls toward the disk.
Which of the following types of interstellar gas is coldest and densest?
molecular hydrogen
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. They all orbit in roughly the same plane and in the same direction.
How do stars orbit within the bulge of the Milky Way?
The central bulge shows up as a peanut-shaped glowing ball of stars and the spiral arms and their associated dust clouds form a narrow band. As the stars go round in their orbits, they also move above or below the plane of the bar. When stars cross the plane, they get a little push, like a child on a swing.
Do stars form in the disk?
The disk is mainly composed of gas, which rotates with the disk and slowly approaches the surface of the proto-star. When the gas comes close enough to the star, it falls onto the surface of the star because of gravity, and the star grows.
What are basic characteristics of stars orbits in the disk halo and bulge of our galaxy?
What are basic characteristics of stars’ orbits in the disk, halo, and bulge of our galaxy? The disk stars have nearly circular orbits. They have vertical motions out of the plane, making them appear to bob up and down, but they never get “too far” from the disk.
Is the interstellar medium more or less dense than the air in your room?
The interstellar medium is vast and expansive in size but very, very low in density. For comparison, the air we breathe has approximately 10 million trillion molecules per cubic centimeter, while some of the lowest density areas of the interstellar medium consists of approximately . 1 atoms per cubic centimeter.
Where does most star formation occur in the Milky Way today?
10) Most of the current star formation in the Milky Way occurs in spiral arms.
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