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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
Is the milky way part of your solar system?
The Milky Way isn't in the solar system, the solar system is in the Milky Way, about 27,000 light years from the center, at the edge of one of the spiral arms.
If a protostar doesn't undergo a nuclear fusion what will it turn into?
If a protostar does not undergo nuclear fusion, it will not become a star. Instead, it will either become a brown dwarf, which is a failed star that lacks the mass to sustain nuclear fusion, or it will simply cool down into a cold, dense object known as a sub-stellar object.
Why does the milky way look like a hazy band of stars in the sky?
The Milky Way appears as a hazy band of stars in the sky because we are viewing it edge-on from within the galaxy. The combined light of billions of distant stars, interstellar gas, and dust within the plane of the galaxy creates this band of light across the night sky.
What type of galaxy is your system in?
Our solar system is located in the Milky Way galaxy, which is classified as a spiral galaxy. It is estimated to be about 100,000 light-years in diameter and contains billions of stars, including our sun.
Which is larger soalr system or globular cluster?
A globular cluster is a collection of stars (solar systems), therefore it is larger.
A globular cluster is a collection of stars (solar systems), therefore it is larger.
A globular cluster is a collection of stars (solar systems), therefore it is larger.
A globular cluster is a collection of stars (solar systems), therefore it is larger.
In what region of the Milky Way Galaxy would you expect to find Type I supernovae Why?
Unlike the other types of supernovae, Type Ia supernovae generally occur in all types ofgalaxies, including ellipticals and they show no preference for regions of current stellar formation - they can occur anywhere in the Milky Way Galaxy.
The reason for this is that Type 1 supernovae occur when the remnant of a small star (a white dwarf) accreets enough mass (by gas capture from, or merger with another star) to exceed the Chandrasekhar limit of about 1.38 solar masses. When this mass is exceeded carbon fusion is reignited in the stellar core and the star explodes and as white dwarf stars are to be found everywhere in Galaxies and Globular clusters, the potential for Type 1 supernovae is universal. That said, obviously you would not expect to find White Dwarf stars in current star forming areas (because the dwarf forms at the end of a stars main sequence life). However Galactic rotation mixes old stars with new stars relatively quickly and this separation rapidly blurs.
In what way is your Earth fragile?
The Earth is not fragile at all; it's a ball of rock 8000 miles in diameter. The Earth has withstood lightning, hail, rain, erosion, earthquakes, meteors, nuclear weapons and collisions that have shaken the planet to its core. It has been fried in the radiation of nearby supernova stars. It's still here after 4,500,000,000 years.
Perhaps you are thinking of life on the planet. This also is pretty tough stuff. Life emerged here on Earth about 2.5 billion years ago, and has withstood everything that the universe could throw at it. On four occasions, planetary disasters have come close to sterilizing the entire world, but we're here now.
If/// WHEN another planetary disaster occurs - and over the next 200 million years, we can be assured that a couple will! - then the human race may or may not survive on the Earth. But life will. And if we're as smart and as tough as we'd like to think we are, then humanity will, too.
What will happen to the people in the Earth if the planets of solar system were alligned?
The alignment of all planets would result in freak weather, planetary oscilllation (wobbling on their axis) and the apocalypse. However few planets are perfectly on the eccliptic so could not be properly algined.
Who is the person who discovered galaxies outside the milky way?
Edwin Hubble was the first to suggest that the Milky Way was just one among a number of galaxies or, as he called them, "pocket universes". Other individual galaxies had been observed previously, but they had been believed to be stars within the Milky Way.
astronomers.
Do the Egyptian pyramids map out the milky way?
No, they do not. There are three main pyramids in Giza, out of Cairo. Egypt has other pyramids, but they do not in any way resemble a map of the barred spiral galaxy that is our beloved Milky Way. The Milky Way contains roughly 400 billion stars.
Do only spiral galaxies emit bipolar jets?
Consider the giant elliptical galaxy M87, it has a very small, bright nucleus and a visible jet of matter 1800 PC long racing out of its core. Radio observations show that the nucleus must be no mre than a light week in diameter.
No, it is not a shape because it is not completely closed at any point of it.
Is the M87 galaxy 54 million light years away?
It doesn't make much sense to talk about something being 52 light-years away from a galaxy: A typical galaxy has a diameter of about 100,000 light-years, and doesn't have a clearly-defined border. Distances between galaxies are hundreds of thousands, or millions, of light-years.
It doesn't make much sense to talk about something being 52 light-years away from a galaxy: A typical galaxy has a diameter of about 100,000 light-years, and doesn't have a clearly-defined border. Distances between galaxies are hundreds of thousands, or millions, of light-years.
It doesn't make much sense to talk about something being 52 light-years away from a galaxy: A typical galaxy has a diameter of about 100,000 light-years, and doesn't have a clearly-defined border. Distances between galaxies are hundreds of thousands, or millions, of light-years.
It doesn't make much sense to talk about something being 52 light-years away from a galaxy: A typical galaxy has a diameter of about 100,000 light-years, and doesn't have a clearly-defined border. Distances between galaxies are hundreds of thousands, or millions, of light-years.
What other Planets in Our Galaxy have enough Oxygen to Sustain Human Life?
If a star system has planets, the availability of oxygen on a given planet is a complicated process. If the planet is of the correct size and in the ecosphere of the star, the production of oxygen will occur through the existence of plant life that will convert carbon dioxide into oxygen. In a primordial planet like an earth, oxygen is not going to be an element that is naturally occurring. The compound carbon dioxide is. It takes plant life to produce an atmoshpere that will sustain animal life.
The odds of this happening in a given star system are low, but possible.
How many star are in our solar system?
There is only one star in our Solar System. It's called the sun. On the other hand, there are 8 planets.
One.
What are galactic associations and clusters?
Galactic associations are groups of young stars that formed together from the same molecular cloud. Galactic clusters are larger collections of stars, often numbering in the thousands, that share a common origin and are bound together by gravity. Both associations and clusters provide important insights into the formation and evolution of stars and galaxies.
Galaxy types from largest to smallest type?
It doesn't really work that way. The types aren't exactly related to size, but rather to shapes. Dwarf galaxies of course are the smallest; but other than that, a spiral galaxy can come in different sizes; so can an irregular galaxy or an elliptical galaxy.
Supermassive black holes found at the centers of galaxies are related to the stellar velocity dispersion in the bulge of the galaxy. To a lesser degree, there is also a correlation with the mass of the galaxy.
Higher, as the increased star formation rate increases the population of massive stars that can lead to supernovae explosions. Starburst galaxies have a higher concentration of gas and dust, leading to more frequent and intense supernova events compared to a galaxy like the Milky Way.
When was the spiral galaxy discovered?
It wasn't until telescopes that people realized that the band of light reaching across the sky, called the Milky Way since ancient times, was actually made of an immense number of stars. Astronomers still did not really understand what they were seeing until the 20th century, however.
Until the 1920s, astronomers thought that what we now know to be our Milky Way Galaxy to be the entire universe, and that our whole universe was a few thousand light years across. Other "spiral nebulae" had been observed, but they were thought to be new star systems forming nearby. After Hubble (the astronomer, not the telescope named for him) observed Cepheid variable stars in the Great Nebula in Andromeda, he realized that the Andromeda "Nebula" was immensley distant, and ennormous in size, and, by extension, the other "spiral nebulae" were also huge and incomprehensibly distant. He called them "island universes", and realized that we were also in one, and that the 'Milky Way' band of stars across the sky was our galaxy's disk, seen from inside. So, even though people have been calling the band of light across the sky the Milky Way for thousands of years, it wasn't until the 1920's that we understood what it was--our galaxy!
We can see only a small part of our galaxy in visible light. Since the 1960s, radio astronomers have mapped out the structure of the entire galaxy, and shown it to be a large spiral galaxy of about 100 billion stars; we are in one of the spiral arms about 8 kiloparsecs (25,000 light years) from the center of our galaxy, more or less halfway from the center to the edge.
I think Gallileo came across the milky way in the 1600's. The cloudy band we now call the Milky Way has been known since ancient times (it's referenced in various cultural mythologies, for example). However, it was only in the past few centuries that it was properly identified as a galaxy, specifically our own.
== == The Milky Way's true age hasn't been discovered. The only knowledge we have is of a meteorite which dates 4.7 billion years ago. And yes, Galileo discovered the odd colors of the Milky Way in the 1600's. If we could escape our galaxy, scientists believe it would look like M-31(The Great Galaxy of Andromeda)
I would hesitate to talk about a "discovery" of something that is in plain sight - that people have been seeing for ... well, for as long as there have been people. Like the Sun, or the Moon, or trees, or animals - or the Milky Way.
Why does the big dipper have 7 stars?
The constelation known as the Big Dipper in USA or Ursa Major (to give it's correct name) is a collection of 7 Stars and is one of the most recogised and easily spotted contellation in the Northern Hemisphere.
It has many other names. In the UK it is called the Plough, in Germany Großer Wagen or "great wagon", Carlswæn or wagon.
What two observations allow us to calculate the Galaxy's mass?
By observing the rotation, and calculating the diameter. If you know the diameter of the galaxy, a certain rotation speed implies a certain mass (to be stable at that speed). It turns out there is 5-10 times more mass than the known masses. Read about "dark mass" for more details.
By observing the rotation, and calculating the diameter. If you know the diameter of the galaxy, a certain rotation speed implies a certain mass (to be stable at that speed). It turns out there is 5-10 times more mass than the known masses. Read about "dark mass" for more details.
By observing the rotation, and calculating the diameter. If you know the diameter of the galaxy, a certain rotation speed implies a certain mass (to be stable at that speed). It turns out there is 5-10 times more mass than the known masses. Read about "dark mass" for more details.
By observing the rotation, and calculating the diameter. If you know the diameter of the galaxy, a certain rotation speed implies a certain mass (to be stable at that speed). It turns out there is 5-10 times more mass than the known masses. Read about "dark mass" for more details.
What is a central dominant galaxy?
A central dominant galaxy is typically the largest and most massive galaxy at the center of a galaxy cluster. It is surrounded by smaller satellite galaxies and can influence the dynamics and evolution of the entire cluster through its strong gravitational pull. These galaxies often exhibit unique properties compared to other galaxies in the cluster.
