What does Protogalaxy mean?
What does Protogalaxy mean?
: a cloud of gas believed to be the precursor to a galaxy.
What happened after the Protogalaxy formation?
Due to the overall motion of matter in the protogalaxy, this gas settles into a disk. Further variations in the density of the gas result in the establishment of “arms” in the disk. When two galaxies come close to each other, they may merge, throw out matter and stars from one galaxy, and/or induce new star formation.
What does Protogalactic cloud mean?
We define a protogalactic cloud as a cloud with mass equal to that of a galaxy, and whose collapse leads to the formation of the currently observed stars.
What is it called when gases dust and matter come together to form dense clumps of matter?
The Short Answer: A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.
What is the 4 types of galaxies?
In 1936, Hubble debuted a way to classify galaxies, grouping them into four main types: spiral galaxies, lenticular galaxies, elliptical galaxies, and irregular galaxies.
How do you describe an irregular galaxy?
An irregular galaxy is the catchall name given to any galaxy that does not neatly fit into one of the categories of the Hubble classification scheme. They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity.
What type of galaxy do we live in?
the Milky Way
What holds an irregular galaxy together?
A galaxy is a group of stars, dust, and gases held together by gravity.
What is the force that holds galaxies together?
gravity
How do stars move in an irregular galaxy?
The stars then move on elliptical orbits around the center, but are perturbed by local irregularities. In spirals and elliptical, the potential is rather symmetric, whereas in irregulars it is quite… irregular.
What is the oldest type of galaxy?
Elliptical galaxies, such as M87, are the oldest and roundest galaxies in the universe. Astronomers think these galaxies are formed in major mergers—dramatic collisions between galaxies that result in one massive galaxy being entirely consumed by another.
What is the oldest thing in the universe?
Universe’s oldest known quasar discovered 13 billion light-years away. Astronomers have found the farthest known source of radio emissions in the universe: a galaxy-swallowing supermassive black hole.
What is the rarest type of galaxy?
elliptical double-ringed galaxy
How old is the youngest galaxy?
Astronomers believe that our own Milky Way galaxy is approximately 13.6 billion years old. The newest galaxy we know of formed only about 500 million years ago.
How old is space?
13.8 billion years
How old is a black hole?
13 billion years old
What is the lifespan of a galaxy?
13.6 billion years
How do galaxy die?
Galaxies die when the stars that live in them stop forming. Scientists were able to glimpse a galaxy as it ejected almost half of the gas it uses to form stars.
What is a dead galaxy?
MACS 2129-1 is what’s known as a “dead galaxy,” because stars no longer form there. Scientists believed that galaxies of this sort had formed by merging with smaller galaxies over time, but MACS 2129-1’s stars didn’t form from these sort of explosive mergers; they formed early on, in the disk of the original galaxy.
How old is the oldest star in the universe?
13.5 billion years old
What is the nickname of the oldest star in the universe?
Methuselah
What is the biggest star in our universe?
UY Scuti
Do we see dead stars?
Probably not. All of the stars you can see with the unaided eye lie within about 4,000 light-years of Earth. But the most distant ones are intrinsically brighter, have more mass and are therefore likely to die in rare supernova explosions.
Are we made of stardust?
Stars that go supernova are responsible for creating many of the elements of the periodic table, including those that make up the human body. ‘It is totally 100% true: nearly all the elements in the human body were made in a star and many have come through several supernovas. …
What is the closest star?
Proxima Centauri
Why do stars twinkle?
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star’s appearance to wobble or twinkle.
How long do stars live for?
Stars live different lengths of time, depending on how big they are. A star like our sun lives for about 10 billion years, while a star which weighs 20 times as much lives only 10 million years, about a thousandth as long. Stars begin their lives as dense clouds of gas and dust.
Why do stars die?
Stars die because they exhaust their nuclear fuel. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
Why do stars look like water?
The Filter of the Atmosphere Viewing the stars from Earth is a bit like looking at them through a a water filter because, compared to the emptiness of space, the atmosphere is dense. Moreover, air is always moving, so starlight appears to be shifting and shimmering.