Questions tagged [milky-way]

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

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1answer
72 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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1answer
120 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 ...
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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 ...
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836 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?...
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1answer
55 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?
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117 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 ...
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1answer
110 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 ...
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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 ...
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130 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 ...
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1answer
59 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
169 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 ...
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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 ...
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95 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 ...
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70 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?
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1answer
142 views

How do galaxies move in space?

Kind of like a shower thought just occurred to me. We've all seen lots of animation about spiral galaxies, how they crash... in virtually all of them, I recall they move in a frisbee way, that is ...
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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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206 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?
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Why does the 70-solar-mass black hole in the LB-1 system challenge current astrophysics?

Recently scientists discovered a large stellar-mass black hole, which (previously) they believed that it shouldn't be possible in our galaxy! Source An international team of scientists say they ...
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1answer
58 views

Can we measure stellar accelerations?

Many people concern themselves with understanding the Galactic potential. To me, the most obvious way is to measure the acceleration of a star, as this is directly related to the potential. So, one ...
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Does the sun cross other spiral arms in its movement around the galaxy's center?

Today, Ansa.it released an article that states: [...]. In questo suo peregrinare galattico, il Sole ha attraversato anche i due bracci della Via Lattea Perseo e Centauro. "Sono zone di alta ...
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Who is Seyfert, and what is “the so-called Seyfert flare”?

The BBC's Milky Way's centre exploded 3.5 million years ago says: A cataclysmic energy flare ripped through our galaxy, the Milky Way, about 3.5 million years ago, a team of astronomers say. They say ...
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1answer
165 views

From what distance will be able to see milky way and andromeda collision? [closed]

Considering that we would out of Milky Way, at what distance would a human will be able to see the collision with naked eye and and how fast would the galaxies appear to be approaching each other
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143 views

More recent data and simulations of “Milkomeda”, the collision of the Milky Way and Andromeda galaxies?

The Space.com headline Hubble Telescope Spots Two Galaxies in a Doomed (but Dazzling) Dance; The galaxies will ultimately crash into each other was probably overstated as seems to be policy in some ...
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1answer
109 views

How did they estimate the mass of Sgr A*'s companion G2 without knowing what it was?

Gizmodo.com's Astronomers Spot Unprecedented Flashes From Our Galaxy's Black Hole mentions Sgr A*'s companion gas cloud G2. That Wikipedia article says: First noticed as something unusual in ...
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78 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. ...
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1answer
118 views

How did they measure the distance to the center of our galaxy to 0.3% accuracy?

The abstract of A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty (Open Access) says: We present a 0.16% precise and 0.27% accurate determination of R₀, the ...
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70 views

Supergalactic and Equatorial coordinates

What's the difference between Supergalactic and Equatorial coordinates?
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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 ...
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28 views

Full picture of our galaxy from the outside [duplicate]

How far a spaceship should travel to take a full picture of our own galaxy from the outside?
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80 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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1answer
40 views

How do I find stars within milky way using galactic latitude and longitude

I have data that contains galactic latitude and longitude of stars. I have to determine all the stars that are within our milky way. How do I find it?
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415 views

Whereabouts of the Pleiades

I assume they should be in the Milky Way galaxy. I have read about it a little but did not find information on where they are. Which galaxy do the Pleiades belong to?
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673 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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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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1answer
56 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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51 views

Luminosity of the Milky Way compared to Seyfert galaxies

This page lists the total luminosity of the Milky Way Galaxy to be $4\times10^{10}$ $L_{sol}$, and $L_{sol}=3.86 \times10^{33}$ ergs.sec$^{-1}$; this gives a total luminosity for the MW of $1.54\...
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1answer
78 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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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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1answer
56 views

How many horizontal branch stars are within 2 kpc of the sun?

For my research purposes, I am wondering how many horizontal branch (HB) stars are within 2 kpc of the sun? I tried to find some with the Gaia DR2 data with a magnitude cut that leaves HB stars out ...
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1answer
113 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 ...
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1answer
117 views

What’s the closest earth like planet we have discovered in our galaxy? [closed]

What’s the closest earth like planet or moon to earth we have discovered in our galaxy?
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118 views

If the Milky Way galaxy is as big as planet earth, how big is Earth?

If the Milky Way galaxy is as big as planet earth, how big is Earth?
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1answer
112 views

What is the angle between the planes of Oumuamua's hyperbola and the Milky Way Galaxy?

Viewing the animations of Oumuamua passing through the solar system, it is apparent that the plane of its hyperbola departs from the plane of the ecliptic by a large amount. The plane of the ecliptic ...
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1answer
266 views

What would our night sky look like if the solar system was 100 light years from the centre of the Milky Way

When we look at photo's of the centre of the Milky Way, it looks extremely bright due to the concentraion of star systems... If our solar system was only 100 light years from the centre of the Galaxy,...
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2answers
351 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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1k views

Why the blank wedges in this very early 21 cm map of the Milky Way? (Oort et al. 1958)

Jan Oort was a pioneer in radio astronomy. Wikipedia says: It has been written that “Oort was probably the first astronomer to realize the importance” of radio astronomy. “In the days before radio ...
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705 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.)
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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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335 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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161 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 ...