Where the galaxy ends?

Answer 1

There are undefined number of galaxies out there, so they never end, but if you're talking about our native (Milky Way) galaxy, according to Wikipedia:
"The main disk of the Milky Way Galaxy is about 80,000 to 100,000 light-years in diameter, about 250,000 to 300,000 light-years in circumference, and outside the Galactic core, about 1,000 light-years in thickness.[citation needed] The galaxy is estimated to contain 200 billion stars but this number might reach 400 billion if small-mass stars predominate."
Though I think that it's quite hard to determine physical boundaries of even our galaxy since all stars are constantly moving and the change of their positions makes all borders a kind of blurred.

Answer 2

Galaxies are "somewhat" dense clusters of stars. As you move to the fringe of a known galaxy, the distance to other stars gets greater and greater, until finally it is only by a real stretch of the imagination that some odd star might be called a part of all of those over there.

In the case of the Milky Way Galaxy, the overall shape or configuration of the galaxy is a disk with a thickness of 1.5 Light Years and a total width of 1500 Light Years. So we are talking about some pretty big distances when speaking about the size of galaxies. It has been estimated that within the Milky Way Galaxy there are over 200 Billion Stars. Each one of those stars "could" have a solar system of its own with from 0 to 10 planets orbiting around it. And each of those planets could have a group of moons orbiting around it like some of the planets within our Solar System have.

When you used the word galaxy in your question with few other words, I feel like you may have meant "the Universe" or "the cosmos." Those terms mean every, every thing that is out there in space - all of it. If that was what you meant to ask about "having an end"... There is no known end to the Universe or the Cosmos.

With the most sophisticated optical and radio telescope equipment that we have now days, scientists and astronomers can "see" objects out in space at a distance of 40 Billion Light Years "in every direction" from Earth. Our equipment does not give us any useable information at distances beyond that - a technical equipment limitation. Maybe some day soon a new technique or improvement will come along that extends our capabilities out to 60 Billion Light Years. Only time will tell.

So, in direct response to your question, standing where you are right now, scientists and astronomers can use their equipment to see things out in space 40 Billion Light Years from that spot. There is no indication whatsoever that space has an end to it anywhere. That is a learned experience and concept which humans have from their education and experiences here on Earth. Space is quite different from things and situations on Earth. Sizes and distances are far more immense. Measurements are made in degrees of arc instead of feet and inches, meters and kilometers, etc..

Beyond the Milky Way Galaxy there are thousands and thousands of other galaxies

Answer 3

Well if you ever read about it and see the pictures of it, its pretty large. We as humans cant really say because as of right now it is beyond our means to travel and find out. Right now we dont even know too much about our solar system, which is one of many in the Milky Way galaxy. We really have a long way to go to anwser that question, at least with certanty.

Answer 4

The disc of the galaxy is around 100,000 light years in diameter. Our solar system is about 25,000 light years from the center of the galaxy.

Answer 5

Galaxies dont have any specific boundries.As the distance from the centre of the universe increases the gravitational pull decreases and it ends at infinity.... So you can only approximate the value.

Answer 6

A galaxy is a group of stars with a killer Black Hole Star in the center...The UNIVERSE never ends cause it is only empty space aka reality.

Answer 7

The galaxy is about 100,000 light years across. Our solar system lies around 26,000 ly from the center, so we are about equidistant between core and edge.

Answer 8

The galaxy ends thats why my teacher says galaxy is a very very very huge area

Answer 9

Our galaxy has billions of stars in it. and every other galaxy also has billions of stars, and there are billions of galaxys. there are more stars in the universe than there are grains of sand on beaches on earth.

and that's just the 'known' universe.

Answer 10

There i9s no point of reference inspace to tellwhre it ends .It ends at its tips and beyond that the woud so many glaxies tha t we hav not yet come across.