What is the star-gas-star cycle?
Star-Gas-Star Cycle. process of galactic recycling in which stars expel gas into space, where it mixes with interstellar medium and eventually forms new stars. Bubble. an expanding shell of hot, ionized gas driven by stellar winds or supernova with very hot and very low density gas inside.
What do we mean by a proto galactic cloud?
What do we mean by a protogalactic cloud? a cloud of hydrogen and helium that contracts to become a galaxy.
What do we call the bright sphere shaped region of stars that lie within a few thousand light-years of the center of the Milky Way galaxy?
Cards
| Term The two globular cluster stars have the same age | Definition because all stars in a cluster form at about the same time. |
|---|---|
| Term What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the Milky Way Galaxy? | Definition the galaxy's bulge |
•Nov 30, 2012
What do we mean by atomic hydrogen gas How common is it and how do we map its distribution in the galaxy?
how common is atomic hydrogen gas. its common in the interstellar medium. how do we map its distribution in the galaxy? it's mapped by the light atoms emit (21cm) when their electrons flip the direction of their spin. since the wavelength is long radio telescopes are used.
How does gas cycle through galaxies?
After gas is accreted, it first forms HI cloud complexes; as it becomes cooler and denser, it transitions to molecular gas. Eventually, the gas clouds become cold and dense enough to gravitationally collapse to form stars.
What happens after many generations of the star-gas-star cycle?
What happens after many generations of the star-gas-star cycle? hydrogen gas decreases.
What do we mean by the interstellar medium?
In a nutshell, the interstellar medium is the material that fills the space between stars. 99% of the interstellar medium is made up of (mostly hydrogen) gas and the rest is composed of dust. The interstellar medium is vast and expansive in size but very, very low in density.
What is the meaning of globular cluster?
Globular clusters are stable, tightly bound clusters of tens of thousands to millions of stars. They are associated with all types of galaxies. Globular clusters are typically much larger than open clusters and are tightly gravitationally bound.
What happens after many generations of the star gas star cycle?
What happens after many generations of the star-gas-star cycle? hydrogen gas decreases.
Who named the Milky Way?
"The term was in common use in Western astronomy 2,500 years ago," Stanley said, referring to stargazers in European countries. "So there's no way of knowing who first coined it and how it first came to be. It's one of those terms that's so old that its origin is generally forgotten by now."
Where is neutral hydrogen found?
hydrogen cloud, also called H I region or H i region, interstellar matter in which hydrogen is mostly neutral, rather than ionized or molecular. Most of the matter between the stars in the Milky Way Galaxy, as well as in other spiral galaxies, occurs in the form of relatively cold neutral hydrogen gas.
What creates the superheated fountains bubbles of hot ionized gas that erupts from the disk?
The wind sweeps the material creating a bubble of hot, ionized gas. The bubble breaks out of the disk and ejects gas.
What is a dead galaxy?
The “dead” moniker describes the fact that these galaxies no longer have the necessary cold hydrogen gas to make stars. Without the gas, there's no clumping of matter that eventually leads to the formation of a star.
Which stars formed first in the Milky Way galaxy?
Population III stars were the first suns to form in our 13.8-billion-year-old universe, and they're identifiable by their unique composition: just hydrogen, helium and lithium, the only elements around immediately after the Big Bang. Heavier elements were forged in the cores of these stars and their successors.
Where do stars form in the Milky Way?
Star Formation Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
What are interstellar gasses?
The gas between stars is mostly hydrogen and helium scattered at varying densities between the stars in our galaxy and other galaxies. The proportions of the gases are similar to those in the Sun. Interstellar gas supplies the raw material for star formation.
What is dust grain?
Grain dust is the dust produced from the harvesting, drying, handling, storage or processing of barley, wheat, oats, maize or rye and includes any contaminants or additives within the dust (eg. bacteria, endotoxin, fungal spores, insects and insect debris, pesticide residues).
What is a star cluster called?
star cluster, either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin. The two types are open (formerly called galactic) clusters and globular clusters.
What is the difference between open and globular star clusters?
Globular star cluster are very symmetrical in shape, and are densest toward their centers. Open star clusters are more irregular in shape. Globular clusters orbit in the halo of our galaxy, centered on the galaxy's center and expanding above and below the galactic disk. Open star clusters tend to orbit within the disk.
Is our galaxy name?
Astronomy > The Milky Way Galaxy. Did you know that our star, the Sun, is just one of hundreds of billions of stars swirling within an enormous cosmic place called the Milky Way Galaxy?
How many galaxies are there?
In total, Hubble has discovered about 100 billion galaxies in the Universe. However, after James Webb is fully operational, this number will probably increase to 200 billion. Moreover, scientists are not sure that even 200 billion galaxies is the final figure.
Is hydrogen a metal?
Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals.
What is a hydrogen cloud?
hydrogen cloud, also called H I region or H i region, interstellar matter in which hydrogen is mostly neutral, rather than ionized or molecular. Most of the matter between the stars in the Milky Way Galaxy, as well as in other spiral galaxies, occurs in the form of relatively cold neutral hydrogen gas.
How does a lenticular galaxy differ from a normal spiral galaxy quizlet?
How does a lenticular galaxy differ from a normal spiral galaxy? It has no spiral arms.
How do we know the Milky Way has a black hole?
The black hole distorts the space around it, which warps images of stars lined up almost directly behind it. This offers telltale evidence for the existence of lone black holes wandering our galaxy. The light from a background star is deflected and brightened by the black hole's intense gravitational field.
What is the most beautiful galaxy?
NGC 2336 is the quintessential galaxy — big, beautiful, and blue — and it is captured here by the NASA/ESA Hubble Space Telescope.
Can humans travel to another galaxy?
The technology required to travel between galaxies is far beyond humanity's present capabilities, and currently only the subject of speculation, hypothesis, and science fiction. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible.
What is our galaxy name?
The Milky Way The Milky Way gets its name from a Greek myth about the goddess Hera who sprayed milk across the sky. In other parts of the world, our galaxy goes by other names. In China it's called the “Silver River,” and in the Kalahari Desert in Southern Africa, it's called the “Backbone of Night.”
Who made the galaxy?
The first galaxies were identified in the 17th Century by the French astronomer Charles Messier, although at the time he did not know what they were. Messier, who was a keen observer of comets, spotted a number of other fuzzy objects in the sky which he knew were not comets.
What is our galaxy called?
The Milky Way Galaxy Astronomy > The Milky Way Galaxy. Did you know that our star, the Sun, is just one of hundreds of billions of stars swirling within an enormous cosmic place called the Milky Way Galaxy? The Milky Way is a huge collection of stars, dust and gas.