Questions tagged [milky-way]

Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.

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91 views

Are the bright dots in this image individual stars?

I saw this picture of M51 (Whirlpool galaxy) and noticed many, many bright dots around and in the galaxy. I have freehand-circled a few as examples. Are these individual stars (probably supergiants) ...
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153 views

Location of the milky way in August in Death Valley

I am going to be in Death Valley around August 8th. I was hoping to take a milky way shot with my camera when there. I would be shooting around 10pm. I am using google maps to scout out popular ...
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202 views

If someone was above the galaxy, how much of it can he see?

If someone was far enough above the milky way to see the entire diameter, how much can he actually see with naked eye? I'm aware that on Earth, we only see stars within 1,000 light-years (roughly) by ...
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740 views

Are the viewable nebulae only in our galaxy?

Where are all the nebulae located? Yes, a simple question that should be obvious but apparently is not to me. To be more explicit, how far are all these objects? Are they mostly in our galaxy? I'm ...
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124 views

visualisation of galaxy density

If I had a long stick that was millions of light years long, and with a width of about the Sun, and I then swiped it through the center of the milky way galaxy, what would the probability be of me ...
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70 views

How does the Sky in Google Earth Pro work?

For those who don't know, Google Earth Pro has a feature where you can see what the sky should look like based on the time and geographical location. I know Google Sky says that Google Earth uses ...
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1answer
93 views

What is the likely closest encounter for a typical star during the Milky Way Andromeda Merger?

This is closely related, but distinct question to What are the chances of a star colliding with another during a galactic collision?. The accepted answer to that question places the odds of the Sun ...
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70 views

Direction of movement sun with respect to the NGP

When viewed from above, i.e., looking down from the North Galactic Pole towards the South Galactic Pole, does the sun rotate clockwise or counterclockwise around the Galactic center?
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Coordinates of known black holes in our Galaxy (Milky Way)

There are some articles in wikipedia with the list of known (or candidates) black holes here and list of nearest black holes. Also there is a map of Milky Way. My question is where can I get ...
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308 views

What would be the outcome for life in our galaxy if the merger of the Milky Way and Andromeda creates a Quasar?

If predictions are correct, the Milky Way and Andromeda are set to collide in around 4 billion years. If, when this occurs, a Quasar is formed by matter being accreted to the common galactic center (...
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670 views

Metal rich or metal poor?

What does the image in the link mean? Are the stars in the halo high in metallicity or low? How about at the bottom by the disk? http://science.psu.edu/alert/images/SDSSmetals.jpg/...
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77 views

Looking for a routine to correct for Local Standard of Rest (LSR)

I've been scanning the Milky Way with a Small Single Dish Radio Telescope, obtaining Spectral data with a Span of ~ 2 MHz, centered at the 21 cm line. With this information I can derive a relative ...
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301 views

A rough analytical expression for the Milky Way's radial mass distribution?

I found the image below in Space.com's article This 3D Color Map of 1.7 Billion Stars in the Milky Way Is the Best Ever Made, although it is not the map mentioned in the title. The caption for this ...
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165 views

Question regarding the Milky Way when calculating galactic space velocities for galaxies

I have been calculating galaxy space velocities (where proper motions are known) in order to measure their orbits of the Milky Way using the method proposed in the appendix of http://www.aanda.org/...
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74 views

In Chromoscope, what is the X-ray source between Ophiuchus, Libra and Scorpius?

Chromoscope is a nice toy. Pressing 'L' shows the constellations as guide. There's a bright X-ray source between Ophiuchus, Libra and Scorpius. In Hydrogen-Alpha there are two circular formations to ...
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46 views

Can the lensing effect of Sagittarius A* be used to image the stars diametrically opposite to the sun?

The sun can magnify an image of a source 100 ly away nearly 100 billion times, if the ring is captured from the nearest focal point (550AU). According to Christian Ready of Launch Pad Astronomy, we ...
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77 views

Luminosity of the Milky Way compared to Seyfert galaxies

This page lists the total luminosity of the Milky Way (MW) Galaxy to be $4\times10^{10}$ $L_{\rm sol}$, and $L_{\rm sol}=3.86 \cdot 10^{33} {\rm ergs.sec}^{-1}$; this gives a total luminosity for the ...
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47 views

What are the odds for any two bodies to collide during the milky way-Andromeda collision? [duplicate]

When the two main galaxies of the local group will collide, it is very unlikely for stars to collide with another, but how unlikely is it in the initial collision? And over the whole merging process?
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155 views

How to to compute the expected number of collisions between stars when Milkyway and Andromeda merged? [duplicate]

Can some one tell me how you can roughly estimate the number of collisions when Milkyway and Andromeda merged with each other. I know it is somehow related to the mean free path of the star. But ...
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54 views

How many times has the sun orbited the galaxy? [duplicate]

Even if our solar system is not in a stable orbit around the center of the galaxy (is it?), since the birth of our sun, how far has it traveled relative to the center of the galaxy?
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55 views

Does the quantity of dark matter needed in the Milky Way to give the stars their speed compare with the speed of the Milky Way?

Dark matter was needed to give the stars in a spiral galaxy a cause of their speed. So they proposed there must be some extra dark matter in the Galaxy. The total extra mass of dark mater is quite ...
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100 views

What will the mass of the new galaxy be?

When the Milky Way galaxy collides with the Andromeda galaxy, what will the mass and volume of the new galaxy be?
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402 views

Where is the center of the Milky Way located?

I have downloaded a star database from this page (The HYG Database): http://astronexus.com/node/34 And all the stars have (among other parameters) their XYZ coordinates in parsecs according to this ...
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3answers
438 views

Is the Milky Way seen as how it looked millions of years ago?

The distant an interstellar object is, the more time is required for light to travel, which is known, measured as light years. So are the farthest stars and gas clusters in the Milky Way seen as how ...
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81 views

Earth orbit around the Sun and its position in the Galaxy

Given the orbit of the Earth around the Sun and the position of the Sun in the Galaxy, in which season are we (the Earth) closer to the galactic center?
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91 views

Is there any official star gazing location list?

I recall when I was a child (many years ago) my father taking us out to gaze at the starts. I remember being able to see the Milky Way with our naked eyes (North Central New Jersey). Nowadays living ...
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342 views

The Sun or Our Galaxy revolves around what? [duplicate]

Like every planet they are in orbit of something or another planet like our solar system every planet revolves around the sun, my question is: what's the name of the planet or object which the sun ...
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145 views

Calculate how long it takes for the sun to complete one orbit around the galaxy?

We know the speed that the sun travels around the galaxy is $220\, {\rm km/s} = 0.00021 \, {\rm parsec/year}$. I'm unsure of how to find the period?
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175 views

Movement of the Sun in space

Does the Sun undergo any cycles or revolutions approximately every 24,000 years or 8.6 million years? In Hinduism it is believed that the Sun revolves in an elliptical orbit around a large mass at ...
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655 views

What is the minimum distance from city that allow to see Milky Way plane? [closed]

The light pollution fades the starlight coming from the Sky and this dont let people to see the Milky Way disc. Is there any study about this?
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2k views

What is that light of the middle of the milky way galaxy?

I'm Being confused what is that light in the middle of milky way galaxy? Image is from Charting the Milky Way From the Inside Out The text with the image explains a lot about the spiral arms and the ...
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1answer
68 views

The equation for calculating how many times Earth (or our solar system) has revolved around the Milky Way

I have seen it said on Quora and Reddit that it's about every 220-250 million years to go around the Milky Way from Earth. Wondering what the rough equation is for calculating it. That is, I guess, ...
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66 views

How could I determine what areas of the Milky Way will be visible?

There is a new moon on Saturday, and the forecast in my area of Winnipeg, Manitoba, Canada calls for clear skies on that night. I would like to take a widefield astrophotograph. I have no idea what ...
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810 views

Is our supercluster part of a galaxy filament?

It was discovered recently that the Milky Way galaxy lies inside a supercluster named Laniakea Supercluster. On the other hand, wikipedia says that galaxy filaments are "the largest known structures ...
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116 views

How big would the Milky Way be if all the stars were emptied into one sphere?

Neglecting the fact that this ball of gas would just collapse on itself - I'm curious if there's an agreed-upon measurement that takes into account the volume of all the ~100 billion stars to predict ...
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1answer
154 views

What factors determines the size of a galaxy?

Recently i saw a post comparing sizes of different galaxies with the Milky Way. The largest one being the Ic 1011.What makes this galaxy so large? What factors decide the size of a galaxy?
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87 views

Find a planet with incomplete information of a star chart [closed]

I am wondering why it was so hard to locate Luke in Star Was Episode 7, if you already have the small part of the map. Suppose we have a sector of our galaxy that roughly equals the one missing in ...
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2answers
334 views

How is a Galaxy formed?

How is a galaxy formed? I know that the center of our galaxy is considered to be Sagittarius A* and it's surrounded by a lot of stars (also a lot of neutron stars). But what makes this happen? I mean,...
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528 views

How to orient ESO's Milky Way Panorama in a 3D model

I have been trying hard to find the star "Polaris" in the following image from ESO and Serge Brunier: From peering at other maps and simulation apps, I think it should be in the top-left quarter, ...
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1k views

What's the relationship between Moon phase and the Milky Way visibility?

I've been using an IOS app to predict visibility of the Milky Way. I'm planning a trip to capture the Milky Way on 9th March 2015, but the app shows the visibility will be very weak on that date. ...
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500 views

Can we know whether any distant galaxy is moving away in same direction or in opposite direction w.r.t. our galaxy?

The Hubble law states that the recessional velocity of a galaxy is proportional to its distance from us. It takes redshift and angular sizes (for distance) of the galaxy to determine velocity, and ...
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338 views

What are angular sizes of thin and thick disks in our Galaxy?

What are diapasons of galactic coordinates for thin and thick disks of our Galaxy?
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137 views

What resolution is needed to see a quasar through the galactic center?

The center of the galaxy is densely packed with stars and obscured by a whole lot of dust between us and it. For those reasons, groups that study the motion of stars around the super-massive black-...
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42 views

Data for “milky way outline” [duplicate]

I am trying to make a software generated star chart, and want to include the outline of the milky way as shown in many such star charts. Does anyone have any idea where to obtain the data for that? ...
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In the milky way which star(s) are farthest from galactic plane?

I am looking for at least one star on each of the side of the galactic plane. I understand there would be an error tolerance. So, please do not hesitate if the answer is not exact. Preferably, please ...
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36 views

Clarity on dust extinction terms and implementation: R_V, A_V, and E(B-V)

I have created a model galaxy spectrum using STARBURST99 and want to compare it to an observed spectrum of a particular galaxy. I understand that I need to redden ...
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79 views

What pole is closer to the galactic edge? [duplicate]

Suppose 2 spaceships leave from the earth's north and South Pole going straight up which one will exit the galaxy first (assume they have the same speed and are going in a totally straight line) ? ...
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Modern Astrophysics [closed]

I was wondering whether it has proven whether the universe is expanding and if so, what is its ratio, one more question that whether it has an effect for the centrifugal forces, i.e gravity and the ...
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1answer
84 views

How to approximate the distance at which the thin disk peaks along a given LOS from Earth for a given galactic coordinate per 1 sq deg?

The density of stars drops off exponentially from the center of the galaxy and can be approximated as follows using a cylindrical coordinate system: $$ \rho(R, z) = \rho_0 \exp \frac{-R}{h_R} \ \exp \...
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947 views

Does Earth revolves around Milky Way?

As we know Earth rotates around Sun and Sun around Milky Way but then Sun must have some velocity/angular momentum (I don't know that much physics terms). So as Earth revolves around Sun, it must ...