That we need better theories and measurements. We cannot directly measure the mass of anything we can't put on a scale in a laboratory. What we can do is measure things like the light and other electromagnetic radiation coming at us from other objects in our direct line of sight, and apply theoretical computation and a few good guesses to get an approximation of what the mass of that object is. Taking into consideration that there are millions of objects in our milky way, and that more than half of them are not in our direct line of sight, these approximations change quite a bit when we apply different theories to what we have measured. Also, we are getting better tools to measure with, like better telescopes, detecting a wider range of electromagnetic radiation, putting some of these tools on sattelites so we get a better view, and developing more workable theories to help us explain the universe around us based on these measurements.

When we talk about large stars, lets make sure we know what we mean. Do you mean the brightest, largest in circumference or largest in terms of mass (heaviest) ?? There are less massive starts, which outshines more massive cousins and as stars go through their life cycle, at times they can expand dramatically (larger circumference) just prior to dying.

The most massive star is generally thought to be the Pistol star near the center of our galaxy. This being said, we have not found all the stars in our galaxy yet, and larger (more massive) stars could still be found.

All the planets in the solar system are approximately the same age. Extrasolar planets are all approximately the same age as the star they orbit.

Population II (low metallicity) stars are the oldest stars, but they're unlikely to have planets.

No. The universe is expanding; galaxy clusters are getting farther apart. This expansion only works over distances of hundreds of millions of light years, not the much smaller distances within galaxies.

The closest star to the sun is Proxima Centauri, but its brighter neighbor Alpha, double star, is so nearly the same distance that data about it are usually given. It is about 4 light years distance, or about 3.8x1016 m.

Probably, but at present we have no way to get out there. It may take tens of thousands of years to be able to get a camera out there, and then it would take another 10,000 years for the signal to get back to Earth.

There are many asteroid formations in the Milky Way. Of those, three orbit our sun, Sol. The first, and most commonly known, asteroid formation in our system is the Asteroid Belt (sometimes called the Main Belt). It is located approximately 3 AU (448,793,612.1 kilometres) from the sun, and is comprised of mostly rocky asteroids in a belt formation. The second is the Kuiper Belt, a belt formation of icy asteroids and dwarf planets. The third is the Oort Cloud, a theorized cloud of asteroids orbiting far beyond the Kuiper Belt.

We don't know exactly, but scientists believe that red dwarf stars, which are very small and very slow-burning, may date from the early history of the universe about 15 billion years ago. The problem is that red dwarf stars are very small, and so very dim; and thus difficult to see from any real distance.

The Milky way is a galaxy. A spiral galaxy, to be more precise.

The Milky way is a galaxy. A spiral galaxy, to be more precise.

The Milky way is a galaxy. A spiral galaxy, to be more precise.

The Milky way is a galaxy. A spiral galaxy, to be more precise.

it is so we get hours,days,weeks,months,years and leap years

Well, no. That is what happens when the planet earth orbits the sun.

Our sun doesn't exactly orbit the Milky Way. Rather, it travels along with it along one edge.

he discovered it on

There are four major arms in the Milky Way

* 3 kpc and Perseus Arm * Norma and Cygnus Arm with a new extension. * Scutum Crux Arm * Carina and Sagittarius Arm There are also a number of smaller arm, or spurs.

* Orion Arm (Of which the Milky Way (Our Galaxy) is included) * New Outer Arm

See related link for pictorial representation.

The Milky Way was born when countless warm gas clouds come together under the pull of gravity. When the cloud collided, Stars were born. Nine billion years after its birth, the Milky Way settled down. there is a huge black at its centre, it is quite. The Galaxy now consists of billions of stars arranged in a beautiful spiral shape.

They are both spiral galaxies, except the Milky Way is a barred spiral and the Andromeda is a typical spiral galaxy. The Andromeda has at least twice as many stars as the Milky Way, and it has more mass. The galaxies are going to merge in 4 billion years, and now they are about 2 million light years apart.

Like a long (milky colored) cloud in the sky - that moves with the stars and not the wind.

There's only 1 universe the milky way is a galaxy

According to newest observations, 258,000ly across, or 1.5167 quintillion miles. but 18 zeros are quintillion in the USA, remember that in some places like mine 18 zeros is a trillion.

Because people thought the milky way needed something to represent it's creaminess.

We - as in the Solar System, are located about 25,000 light years from the centre of the Milky Way Galaxy and about 25,000 light years from the edge.

The Sun and the rest of the Solar System are close to the inner rim of the galaxy's Orion Arm, in the Local Fluff inside the Local Bubble, and in the Gould Belt.

As a picture is better than words, see related link for an artists impression.

The milky way is classified as a galaxy...

A barred spiral galaxy.