0
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 Coma cluster the nearest cluster?
The Coma cluster is one of the nearest clusters but it is not the nearest. At a mean distance of about 321 million light years the Virgo Cluster is closer at a mean distance of only 59 million light years.
How much of the Milky Way galaxy have we discovered?
At the moment, or even in the future - we will never know.
Even if we managed to explore every star and planet in the whole Milky Way, by the time we had finished, more moons would have been created somewhere else.
Emission nebula take up about how much of the Milky Way galaxy?
Considering the size of the Milky Way Galaxy and the amount of "empty" space, the amount of space an emission nebula occupies is so small as to be infinitesimal and impossible to equate to a volume.
What is the new planet in the milky way galaxy called?
There are no known new planets. However, planets that are new for us, i.e. that were not previously known, are discovered, at a rate of several hundred planets a year. In other words, there is no "the" new planet.
What are the spectral lines of starlight from distant galaxies?
They are the characteristic frequencies of the elements "burning up" in the stars in the galaxy interspersed with absorption lines of other material between these elements and the earth. All these wavelengths will be increased by the red shift which results from the galaxy receding from the earth.
What is the name of the large spiral galaxy found in the bottom right of the Hubble Deep Field?
The point of the Hubble Deep Field observations is that scientists pointed the Hubble Space Telescope toward a dark patch of the sky where there were no known stars or galaxies. Everything observed in those photos had been entirely unknown before the images were obtained. So, nothing there has a "name"; by now, it probably has an index number in some database. But not a "name".
A star is a massive sphere of plasma compressed to incredible heat and pressure by gravity. Stars are made mostly of hydrogen, helium, and a few other elements. Stars produce large amounts of energy through nuclear fusion, in which they combine hydrogen to make helium. As a star ages it will begin to fuse heavier elements. The energy released by nuclear fusion is the reason why stars are so bright and hot. Stars are formed when a giant cloud of gas and dust floating in space collapses under the influence of its own gravity. Every naturally occurring element on Earth was synthesized within a star and released into space when the star died.
The distances of individual stars vary greatly, but in general they are very far away from us. This is why they appear as tiny points of light in the night sky, despite the fact that they are actually very large. There are different types of stars which vary in size, luminosity, and age. Stars called giants can be hundreds or thousands of times larger than the Sun. Our Sun (the closest star to Earth) is considered a main-sequence yellow dwarf. The closest star to the Sun is Proxima Centauri, a red dwarf about 4.2 light years (or 25 trillion miles) away.
(The term "star" is also used metaphorically to describe theatrical, television, and movie actors who are particularly popular.)
star is a heavenly body that is made up of oxygen ,helium,hydrogen etc.
A star is an luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun.
A quasar is not a galaxy. A quasar is an intense energy source associated with a supermassive black hole that is actively feeding. All quasars are located at the centers of galaxies.
An elliptical galaxy
How would other galaxies appear to move relative to Earth if the universe were shrinking?
If the Universe was shrinking the galaxies would appear to be moving towards the Earth, and look more blue than they should. This is the opposite to the universe expanding where galaxies would appear to be moving away from the Earth, which we know due to "red shift". Andromeda would be the exception since it's directly moving towards the Milky Way.
Does the colour of a galaxy reflect its distance away from the earth?
No, however, we can determine whether a galaxy is moving towards or away from us, by looking at the shift in its spectrographic analysis. There are "red shifts" and "blue shifts" in spectrographic results. "Blue shifts" indicate that a galaxy is moving towards us, because the wavelength of the light emitted by the galaxy is compressed, causing it to shift to the blue end of the colour spectrum. "Red shifts" indicate that a galaxy is moving away from us, because the wavelength of the light emitted by the galaxy is being stretched towards the red end of the colour spectrum.
What is the boundary between the solar system and interstellar space?
The Solar System has no predefined limits.
Generally the limit of the Solar System and interstellar space is at a place called the Roche limit where our own Sun's gravitational influence is diminished by another - usually star - interstellar object.
This boundary is generally accepted to be the mean distance between our Sun and Alpha Centauri A or about 2 light years from the Sun.
What was the purpose of the Vostok 1?
To put a man into orbit around the Earth, and do it before the Americans did.
What two Magellanic clouds can you see with the naked eye?
There are two "dwarf galaxies" near the Milky Way, called the Large Magellanic Cloud and the (wait for it..... ) SMALL Magellanic Cloud. Guess who discovered them?
Ferdinand Magellan (more likely, his navigator....) while he was on his history-making round-the-world voyage.
So WHO can see them? People in the southern hemisphere; they are not visible from Europe. Or, unfortunately for me, from California. :-(
Where is Earth located relative to the center of the Milky Way?
in the middle of the milky way
* * * * *
No it most certainly is not - unless your idea of middle is rather vague.
According to Wikipedia (see link below), the Sun and therefore the Earth, is near the inner rim of the Orion Arm, at a distance of approx 8.33 kiloparsecs (27,200 light years or 2.57*1017 kilometres) from the Galactic centre.
Is there aliens living in other milky way galaxy?
there are no other milky way galaxys there is only one so your answer is no
Is it 83 percent of the people who smash cake it each other faces at a weeding get a divorce?
no they do not (yes they do jk)
Milky way - "I bet i could take you on in a fight, Andromeda!"
Andromeda - "Bring it on!"
No galaxies do not think!How can the Doppler effect determine if things are moving towards a distant galaxy or away from one?
Light had properties of frequency that related to colour. It is apparently contract in the direction moving toward the observer (higher frequency-short wavelength) and apparently elongated in the direction moving away from observer (lower frequency-high wavelength).
What moving toward us is tend to be look more blue than usual (blue shift) and what away from us is redder than usual (red shift).
How many light years will it take to get out of the milky way galaxy?
Light-years is a distance, not a time measurement. If you are asking how many light-years a person would have to travel to be outside of the Milky Way galaxy, the answer depends on the "direction" one wishes to use when exiting. The Milky Way, relatively speaking, is almost flat, with a thickness of only 9.26 quadrillion kilometers which is roughly 1000 light-years. While this sounds like a large distance, compare that to the width which is between 9,260 to 11,353 quadrillion kilometers or 100,000 to 120,000 light-years across. Therefore, if you went the thin way, it would be a maximum distance of 4.63 quadrillion kilometers or 500 light-years. If you went the thick way, the distance would be sufficiently larger.
Because light takes time to travel. Light travels at approximately 300,000km/second.
The Sun is about 150 million km away from Earth. Light takes 8 minutes to reach us from the Sun.. But for a galaxy 1 million light years away, the light takes 1 million years to reach us. So when it finally gets here, it shows that galaxy as it was 1 million years ago. It could explode tonight but we wouldn't know until the light reached us in 1 million years.
Ancient astronomers, reaching back to the Greeks and Persians, theorized that the Milky Way might be composed of distant stars. (One such, the Arabian scientist Alhazen, proved using parallax measurements that the band had to be much further away than his contemporaries had previously believed.)
But the official discovery that the Milky Way was composed of stars belongs to to Galileo Galilei, who first trained his telescope on that region of the sky in 1610.
Building on this, in 1750 Thomas Wright was the first to propose that the Sun might be part of a much larger body of stars (what we now call a galaxy) and that the Milky Way could be the result of looking at all those other stars head-on.
Why do astronomers observe the galaxy at millimeter wavelength?
Millimeter wavelengths are short frequency radio waves astronomers use because they can see gases and other phenomena not visible in visible light. MM wavelengths are usually used where the air is dry so water vapor can't scatter the waves.
