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Galaxies
Galaxies are large systems of stars and interstellar matter, and they contain billions of stars. Our own galaxy, the Milky Way, has 200 to 400 billion stars, and there are over one billion known galaxies. Questions that have to do with galaxies in general and specific galaxies are perfect for this category!
2,392 Questions
How do astronomers use pictures of distancee galaxies to determine the age of the universe?
The general tendency is for galaxies that are farther away from us, to move away from us faster. This can give a rough idea of a galaxy's distance, just by observing its redshift (which is a measure of how fast it moves away from us).
What kind of cluster is a tight group of older stars in the halo of spiral galaxies called?
I think you are describing a "globular cluster", which are associated with older stars by most astronomers.
What does the Milky Way galaxy consist of?
There are between 200 and 400 billion stars in the Milky Way, mostly spread out in a spiral disk surrounding a dense central region. Vast clouds of gas and dust called nebulae occupy much of the space between these stars, called the interstellar medium. There may also be debris and planetary objects orbiting the stars or drifting through space. At the center, there is a bar-shaped gathering of stars and gas around 27,000 light years long called the galactic core. Around this is a disk-shaped grouping of stars and matter called the stellar disk, which stretches to about 100,000 light years across and averaging 1,000 light years thick. Our Solar System is located on one of the spiral arms making up this disk. Finally, marking the outer boundary of the galaxy is the galactic halo, which is spherical and contains older stars than the disk. It surrounds the inner galactic components at up to 200,000 light years in diameter. The entire galaxy with all its constituents is thought to orbit around a supermassive black hole found in the very center of the galactic core.
The mass of the entire Milky Way is thought to be about 600 billion times the mass of the sun, and it formed a bit over 13 billion years ago. Our solar system orbits around its center about once every 250 million years. Hypothetical dark matter is suspected of occupying most of the detectable mass in the Milky Way Galaxy. While the observable matter (stars, nebulas, etc.) is as much as 400 billion solar-masses, the total theoretical mass of the dark matter is estimated between 600 billion and 3 trillion solar-masses. The Milky Way is the galaxy we are in, along with some billions of other galaxies. There are a few hundred billion stars in our galaxy, and the Sun is a star with average brightness. There are also star clusters, and nebulas which are big clouds of luminous gas.
group of stars or planets
yes and as a we know that a galaxy is of billions or gazillions so its nearly indefinite u stupid don't your teacher teach you something u and ur teacher both r dumb
Where are the oldest stars in the galaxy located?
The oldest stars in a galaxy are usually located towards the centre. Also known as the bulge.
How far away is the Comet Galaxy from the Milky Way?
Mars (and every other planet in our solar system) is nowhere near the center of the galaxy. About 75,000 light years...
What are the majority of stars in the galaxy?
You can fill that out with lots of verbs, for example, "the majority of stars shine". Here are some others:* The majority of stars are smaller than our Sun.
* The majority of stars are main-sequence stars. That means that they fuse hydrogen-1, converting it into helium-4.
How far away is the Triangulum galaxy?
The Triangulum Galaxy (also known as M33 and NGC 598) is a spiral galaxy 3 million light-years from Earth in the Triangulum constellation, and is 60,000 light-years in diameter, and contains 40 billion stars.
What do the different colors of the stars mean?
it means the same thing as a normal nautical star, it was just the person's preference to get it a certain color. the colors have no meaning A NOTE TO ALL: DONT POST ANSWERS IF YOU HAVE NO IDEA WHAT YOUR TALKING ABOUT, YOU MAKE THE WORLD A DUMBER PLACE Nautical a term describing things related to being at sea. Vessels at sea have "rules to the road" green is go red is stop, The port (left) side of a vessel shines a red light off the starboard beam indicating he has the right of way to all vessels to the right of his course because they see a red light, they must "stop" or yield to his right of way, vise versa your ship must yield to all vessels to the left of its course, because the starboard beam (right) light is shining green, indicating to other ships they have the right to go ahead. Left is Red, Right is Green WHY STARS? when you sail the open sea, and you are able to see what a red or green or any light looks like in the distance, it is easily comparible to that of what a star looks like, "NAUTICAL STAR" just some of its many meanings, its not because its the trendy cool thing to do, sorry
What galaxy is 3 million light years from Earth?
Andromeda, our "big sister," is 2.5 million light years away. The magellanic clouds are dwarf galaxies just a few hundred thousand light years off our bow. The Sagittarius Dwarf Galaxy is another satellite galaxy of ours.
http://en.wikipedia.org/wiki/Local_Group
How many galaxies are in the Hubble Ultra Deep Field?
There are at least 3000 galaxies in the Hubble Deep Field North (with billions of stars, planets, and moons in each one; as well as asteroids and nebulae). Their light has taken 13 billion years to reach Earth.
How many stars make up the big dipper?
The Big Dipper is made up of seven stars. It is also called "Plough" or "Ursa Major." Besides the seven visible stars, there are said to be two "attendant" stars which are invisible.
Viewed left to right, the stars are named:
- Alkaid
- Mizar
- Alioth
- Megrez
- Phecda
- Merak
- Dubhe
What evidence is there that galaxies are moving away from Earth?
each day in space, galaxies are moving at about 170 miles per second. The galaxy nearest us is about 2.6 million lightyears away. But also, space is expanding each day, meaning everything is getting further away from eachother, so in some meaning, the galaxy nearest us is moving away( due to space exspanding ) but it is also moving closer, at the same time. so itd be moving away from us more than getting closer. if that helps at all :p
Which one is the biggest universe in the solar system?
There is no such thing. The Universe is much bigger than the Solar System - and there is only one Universe, at least only one that we know of.
What happens when galaxis colide?
When galaxies collide, they don't actually smash into each other; they swirl around each other and eventually become a single galaxy.
Galaxies collide very often, although they take millions of years to do so. In fact now scientists believe that collisions and merges between multiple galaxies make up some of the main elements causing evolution as time passes.
Most galaxies in the universe are made of two or more other galaxies that have collided together.
A galaxy is made of about 40 to 250 billion stars, although our galaxy, the Milky Way, has many more. So you might think that during a collision, numerous collisions will occur between a galaxy's stars, right? But actually the chance of any two stars colliding in the entire two galaxies is almost a straight zero. This is because even though, as I said, there are hundreds of billions of stars in a galaxy, about 99.9995% of material that makes up a galaxy is not made up of stars. That gives you another really big hint of about how big the universe really is.
However, this seems false when colliding galaxies are observed through a telescope. This is because the 99.9995% of space in a galaxy not consisting of stars consist of gases and dust. When the galaxies collide, this material will do so by gravity, the same way we get pulled down to Earth. There also is lots of friction in both of the colliding galaxies, causing shock waves that can trigger star formation in the galaxies that make the collision look astonishing.
How many stars on the galaxies?
A dwarf galaxy can have a few million stars; a huge galaxy can have a trillion stars or more.
Probably type la supernova
Is an Sab galaxy a type of spiral galaxy?
Yes, a SBC galaxy is a type of a spiral galaxy. The have loosely bounded arms.
