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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 you convert heliocentric distance into galactocentric distance?
Look at Xue et al. 2008 in ApJ.
Edwin Hubble.
Which stars are actually a galaxy?
No stars are actually a galaxy. All stars are stars and all galaxies are galaxies. Stars are found in galaxies. Some galaxies look like tiny dots in our night sky, so might look like a star, but they are not stars; they are galaxies.
There is no galaxy specifically known as "Orion Galaxy". Of course, there are millions of galaxies in the Orion constellation, just as there are millions of galaxies in any other direction.
The NGC 6118 galaxy is a spiral galaxy 72 million light-years (redshift of 0.005) from Earth in the Serpens constellation, and is 100,000 light-years in diameter (same size as the Milky Way), and contains about 100 billion stars (same number of stars as the Milky Way). It emitted its light 72 million years ago when the universe was nearly 14 billion years old.
Why is the classification of the milky way so uncertain?
its not, its a spiral galaxy and thats that.
What is the size of Sun as compared to other stars of Milky way?
The Sun is considered an average-sized star compared to other stars in the Milky Way galaxy. It is classified as a G-type main-sequence star, also known as a yellow dwarf star. There are stars much larger and much smaller than the Sun in our galaxy.
How do you find the amount of miles in a light year?
The speed of light is about 186,000 miles per second
There are 60 seconds in a minutes and 60 minutes in an hour. 24 hours in a day, and 365.25 days in a year.
So 186,000 x 60 x 60 x 24 x 365.25 gives 5,869,552,896,000 miles
Which is close enough to the official light year of 5,878,625,373,183.608 miles
What is an elliptical galaxy made of?
Every galaxy is made up of millions of stars.
An elliptical galaxy consists of predominately old stars,.
See related question.
Potential it can mean International Particle Accelerator Conference,
How far is the star Bellatrix from Earth?
Gamma Orionis (Bellatrix) is the third brightest star in the constellation Orion.
It is approximately 240 light years from Earth.
What is the little bear constellation called in greek?
There are a number of variants
Cynosura was a title for the whole constellation of Ursa Minor in Greek classical times, but now refers to the "dog's tail" - Polaris. (Which if you observe Ursa Minor, the tail does seem to be rather long for a bear)
Kunosouris or Kunosoura from from Greek kuon, dog, and oura, tail
Arcas where the constellation represented the son of the Zeus, not a dog or bear.
Ursa Minor was also named the Dragon's wing, and was considered a part of Draco.
Other somewhat dubious ones are:
Aukosoura - Tail, or train of light)
Arktos which was also represented by Ursa Major.
What did people used to think the Milky Way was?
People used to think that the milky way was some milk spilled from a glass by a greek god. Cheers.
What is the name of some of the stars in the Milky Way Galaxy?
When you look up into the night sky, there is only one thing yo can see (with good seeing conditions) that is outside of our galaxy, and that is the Andromeda Galaxy. Every other thing you see in the night sky is here in our galaxy. Any basic book on astronomy gives the names of scores of well-known stars. Just a small handful here: Castor, Pollux, Rigel, Sirius, Vega, Polaris, Spica, Regulus.
Why do the same galaxies can appear to have different shapes to different observers?
The reasons are the same as why a bird's eye view of your house would be different from the front or side elevations.
Are the little dipper and the big dipper kinds objects you might find on a moonless sky?
You can find them on most nights depending on the weather and what hemisphere you're in.
Which gas is most likely to make up the majority of the star of Bethlehem?
It isn't quite clear what kind of phenomenon produced the Star of Bethlehem. Perhaps it wasn't even a star, but something else. The gas that makes up most of a star - assuming it was an actual star, of course - is usually hydrogen; but if it was a supernova explosion - which, once again, isn't known - a supernova has already converted most of the hydrogen to heavier elements.
How many cells are in the brain than there are stars in the milky way galaxy?
From Wikipedia: "One estimate puts the human brain at about 100 billion (1011) neurons and 100 trillion (1014) synapses." The estimates for the number of stars in the Milky Way are only slightly larger: somewhere between 200 and 400 billion.
