Questions tagged [milky-way]

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

Filter by
Sorted by
Tagged with
4
votes
1answer
88 views

How galactic density falls using Oort constants

I am given the observations that Oort constants $A$ and $B$ are, respectively: $14.5 \text{km s}^{-1} \text{kpc}^{-1}$ and $-12 \text{km s}^{-1} \text{kpc}^{-1}$. From these, I am supposed to conclude ...
3
votes
5answers
191 views

If our galaxy is mostly empty space then why does it look so solid?

This question has probably been asked quite a few times, but I'm having trouble finding anything due to the fact that this question is very specific in nature. So I'm asking again. We know that outer ...
4
votes
1answer
82 views

Where can I find a list of retrograde Milky Way stars?

I read in papers that the Milky Way contains some retrograde stars (retrograde to the Milky Way rotation). Does anybody know where I can find a list of them, possibly including data on their distance ...
2
votes
0answers
75 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 ...
2
votes
0answers
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 ...
1
vote
1answer
132 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?
0
votes
0answers
19 views

What is time period of sun revolving around the center of Milky Way? [duplicate]

What is time period of sun revolving around the center of Milky Way?
0
votes
2answers
99 views

Does this galaxy resemble the Milky Way, and is it relatable as the “template” for the Milky Way?

Taking a look at this photo of comet 2I/Borisov and a background galaxy (2MASX J10500165-0152029): And compare it to this rendition of the Milky Way: The two galaxies slightly resemble each other. ...
4
votes
2answers
669 views

Observing the motion of the solar system and galaxy through space?

This is very perplexing. Conditions: planets are moving around the sun (solar system) solar system is moving as part of the galaxy the galaxy is moving through space on some axis galaxy is part of a ...
2
votes
1answer
88 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) ...
4
votes
2answers
121 views

What is the mean separation between a star and its closest neighbor in the Milky Way halo?

My question is inspired by this previous question, Are there any stars that orbit perpendicular to the Milky Way's galactic plane?. In the great answer posted by @ConnorGarcia, one commenter said he ...
14
votes
4answers
3k views

Looking for a detailed Milky Way map

I am a UI designer working on a sci-fi strategy video game. I was wondering wether anybody here might be able to help? I am looking for a top down projection of the Milky Way that labels regions of ...
1
vote
2answers
114 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 ...
0
votes
1answer
35 views

How do we estimate the dimensions and mass distribution of a galaxy's dark matter halo, beyond the effective limits of its visible matter?

Current research suggests that the Milky Way's dark matter halo may extend up to about 10 - 15 times the size of the visible galaxy, and is believed to be roughly spherically symmetrical. But I don't ...
5
votes
1answer
262 views

Is there evidence for galactic “seasons”?

The Solar Year has huge effects on our climate, and the signs of passing seasons are physically evident on Earth. I recently learned about the Galactic Year. To my understanding, our sun orbits the ...
3
votes
2answers
226 views

Explaining the Drake Equation on a smaller scale

So me and my friend were planning a video to explain the Drake Equation (within a time limit of 5 minutes), and we needed some help. This video is aimed at explaining the concept to an age group ...
2
votes
1answer
59 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 ...
5
votes
1answer
114 views

Do we know what's “behind the Milky Way”?

If we do, how? And what are those objects on the other side of the galactic center? We can't see through the dense band of light and dust, but maybe in other spectrums the band is much less dense? But ...
3
votes
1answer
174 views

does the orientation of orbital plane of our solar system rotate with the galaxy

As I understand it, our solar system travels through the milky way with the orbital plane tilted about 60 degrees so that we are sort of traveling in the direction of earth's north. My question is if ...
36
votes
2answers
4k views

Are there any stars that orbit perpendicular to the Milky Way's galactic plane?

Most stars orbit in the Milky Way's galactic disc. But is it possible for one to orbit perpendicular to it? Here on Earth since we're inside the galactic plane we can't get a good view of what the ...
5
votes
1answer
204 views

Is there a retrograde star that passes closer to the galactic center than our Sun?

Our Sun is moving in a prograde orbit around the galactic center with a distance of about 8 kpc. This paper says there are many retrograde stars in the galactic halo 10-20 kpc from the galactic ...
6
votes
2answers
2k views

Does the Milky Way belong to a Galaxy cluster

I know that the Milky Way is a member of the Local Group and the Virgo Supercluster / Laniakea Supercluster. However, I can't seem to find any information about the Galaxy cluster we belong to. Does ...
7
votes
2answers
1k views

In which direction does the ecliptic plane make an angle of 60 degrees with galactic plane?

In which direction does the ecliptic plane make an angle of 60 degrees with galactic plane? Is it toward the galactic center? (It can have any 360 degree orientation.)
22
votes
1answer
2k views

Do the axes of rotation of most stars in the Milky Way align reasonably closely with the axis of galactic rotation?

The axis of rotation of the Solar System makes a large angle of about 60 degrees relative to the axis of rotation of the Milky Way. That seems unusual - for example, most of the bodies within the ...
2
votes
1answer
211 views

What is the closest galaxy?

I think that the galaxy closest to the Earth, that is, to the Milky Way, is the nebula called Andromeda, which is 2.5 million light years away. Despite this great distance, M31 is visible, and very ...
6
votes
1answer
408 views

Forms of stellar orbits around the galactic center

Do all stars in orbit around Sagittarius A have approximately circular orbits or are there stars that orbit the Milky Way center very elliptically, like being in the Milky Way's outer rim at apoapsis ...
7
votes
1answer
233 views

Why doesn't the black hole in the center of the Milky Way glow similarly to the famous M87 image?

The M87 image made some astronomers famous recently as the first image of a black hole. In the Milky Way, it has been concluded that there must be a black hole due to the movement of stars near the ...
5
votes
0answers
143 views

How far have stars been seen beyond the center of the Milky Way?

What lies near the center of the galaxy is of great interest and in recent times the motion of dozen(s) of stars at the center of our galaxy orbiting around Sgr A* have been measured in great detail. ...
4
votes
1answer
107 views

How many supernovae events are on their way from within the Milky Way?

The Milky Way has a diameter of around 100.000 light years with the Solar system placed some 25,000 light years from the center. If we assume a supernova rate of 1 per century, and also assume that ...
46
votes
3answers
21k views

Does the Milky Way orbit around anything?

We know most of the objects in the Universe have a spherical or elliptical shape. The object which has less mass and gravitational pull orbits around the nearest object with more mass and ...
1
vote
0answers
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? ...
3
votes
1answer
680 views

What is the exact position of the Large Magellanic Cloud?

I am not able to visualize the position of the LMC and have not found a satisfactory explanation... Can someone please answer it this way? Relative to a ray joining the Earth to the Galactic-Center(...
4
votes
1answer
1k views

Is the Large Magellanic Cloud contained in the Milky Way?

From a distance of 160,000 light years, the Large Magellanic Cloud looks at first glance like an isolated section of the Milky Way, running across southern Dorado into neighbouring Mensa. Is the ...
4
votes
3answers
422 views

Apparent magnitude of Milky Way?

We have apparent magnitude of stars, planets, DSOs. What about the apparent magnitude of Milky Way? Can it be estimated?
1
vote
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 \...
13
votes
2answers
2k views

Is it true that we see the center of the milky-way for only half of the year?

I'm not an astronomer, please excuse my non-formal language. Since we are located in one of the arms of the Milky way, the center of the galaxy should be in one direction from our location, while in ...
7
votes
1answer
896 views

Could the Sun and our Solar System one day leave our galaxy?

I have now learned that the Sun is not fixed in place, so I asked myself this question: It is possible, that the Sun and our Solar System will one day leave our galaxy? If yes, how, and if no, why not?...
3
votes
2answers
228 views

How many satellites does the Milky Way have?

The small and large Magellanic clouds are galaxies that are orbiting our own galaxy. How many such "galactic satellites" do we know of?
3
votes
1answer
97 views

Orientation of local star map

This image depicts our solar neighborhood Source The plane defined by the concentric circles, does it have a relationship to any galactic reference points or the ecliptic?
3
votes
2answers
341 views

How many times has the Milky Way rotated?

I would think that is a highly naive question, but I still ask it. Given current experimentally discovered numbers: the Milky Way galaxy is ~13-14 billion years old At the galactic radius where our ...
6
votes
1answer
124 views

Milky Way as seen by the human eye: where exactly do those photons come from?

I'm asking here about the diffuse glow seen by the human eye, when looking at the Milky Way. Where do those visible photons come from exactly? the surface of a star? starlight bouncing off something ...
7
votes
1answer
216 views

How bright would Sagittarius A* be from Earth if it became an Active Galactic Nucleus?

Essentially I'd like to know how bright our central black hole could appear from earth in relation to full moon brightness. Assuming maximum energy output (like when it's gobbling up an entire ...
14
votes
2answers
2k views

Why does the closest approach of star S2 to Sgr A* not appear to be near the focus of its elliptical orbit?

Phys.org's Very Large Telescope sees star dance around supermassive black hole, proves Einstein right links to several ESO videos, including The star S2 makes a close approach to the black hole at the ...
4
votes
1answer
135 views

When can I see the Milky Way from the Earth?

Light pollution is restricting most people from ever seeing the Milky Way from the Earth. Is there any place in India where I can see the Milky Way? Is there a database or site with the list of all ...
2
votes
1answer
68 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 ...
4
votes
2answers
1k views

Why the Milky Way appears to be arching across the sky?

The Milky Way galaxy is disc-shaped and earth is in its plane: (source) In the following image the milky way appears to be arcing across the sky: (source) This looks like an out of plane view of ...
4
votes
1answer
187 views

Volume of Galaxies

Pretty much awkward question though. I would like to ask how is the volume of a Galaxy X is measured? For example consider milky way, what are the techniques to measure the same? How accurate and ...
0
votes
1answer
52 views

Q: star scaling calculation

If in our neighborhood of the Milky Way, the typical spacing between stars is 1 parsec, and the relative velocities between neighboring stars are of order 20 km/sec, what would the spacing between ...
0
votes
1answer
78 views

How is the Sun tilted to its orbit around the Milky Way's center?

We know how the Sun is tilted in reference to its planets but how is it tilted to Sagittarius A or its orbit around it? Or isn't it tilted at all?
62
votes
5answers
18k views

Does the Milky Way move through space?

Does our galaxy moves through space? Or does it stay in a single location? If it does move, what causes it to move?

1
2 3 4 5