Questions tagged [milky-way]

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

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15
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3answers
3k views

Which part of the milky way does the image show?

As a general question and more in specific regarding the image above: Which part of the milky way, planets, stars, clusters are included in the image? How can I know which entities are included in ...
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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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What will happen to the shape of a galaxy when a super massive black hole lying in its center dies(evaporates out)?

What's at the Center of the Milky Way? In this article it is said that a supermassive black hole lies in the center of milky way galaxy. At its center, surrounded by 200-400 billion stars and ...
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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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2answers
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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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What does the milky way look like from earth to the human eye without light pollution?

Cameras are great, they allow us to compress several seconds of light exposure into a single instant. This allows us to take amazing pictures of the night sky, like this one. Of course you can see we ...
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1answer
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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1answer
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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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1answer
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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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1answer
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How far do we have to go to leave the galaxy?

How far is the sun from the edge of the galaxy in the following directions? Moving along the shortest path parallel to the galactic plane (outward radially) Moving along the longest path parallel to ...
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Statistically, what would the average distance of the closest black hole be?

The closest confirmed black hole is several thousand light years away from earth. Our galaxy has about 100 billion stars. I didn't find any reliable information on the black hole count of ratio versus ...
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1answer
132 views

What is the distribution of organic compounds in the Milky Way Galaxy?

I imagine the answer is unknown for the entire galaxy, but I would appreciate a notion of the scales and locations of regions where astronomers have ventured at least a guess to the distribution of ...
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Movement of the stars relative to my position

I live in the Pacific North West (Washington State, US). I have watched the skies for years, looking for constellations that I recognize and keeping track of them. One of them is Orion. As I have ...
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2answers
341 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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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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Is the Sun prograde or retrograde with respect to the rotation of the Milky Way?

I recently learned about the terms prograde and retrograde. I've seen these terms used to describe the rotations and orbits of moons with respect to their planet, and planets with respect to their ...
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1answer
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Solar system data API?

I'm prototyping a real time solar system / milky way discovery app. Could you please help me on: -What is the best orbital data public API I can use? -What is the standard numerical way to define ...
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53 views

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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3answers
381 views

How is the Milky Way on a collision course with Andromeda when the universe is expanding? [duplicate]

At some time in the future it is said our galaxy will collide with Andromeda. Yet at the same time the universe is expanding at a ever-accelerating pace. Using the old raisin-in-the-baking-loaf-of-...
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Has the Milky Way collided with another galaxy?

Has the Milky Way ever collided with another galaxy? Or will the collision with Andromeda be our first?
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If galaxies are moving away from each other then why are the Milky Way and Andromeda galaxy coming towards each other?

The Andromeda Galaxy is approaching the Milky Way at about 684000 mi/hours, making it one of the few blueshifted galaxies. The Andromeda Galaxy and the Milky Way are thus expected to collide in about ...
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0answers
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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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181 views

Where are heavier elements than iron produced?

Specifically in the milky way, if that changes anything. I feel like it should be in the disk, since stars there are richer in heavier elements, but I'm not sure.
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Would Bussard Ramjets work in other places in or near the galaxy? [closed]

Sorry if this this doesn't really fit this forum, but WorldBuilding does not like questions like these. I cannot find the minimum density of hydrogen a Bussard ramjet (an interstellar ship propelled ...
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What specific parts of the Milky Way do we see when we look up?

I know we can't see the center. But do we see any of the central bulge? Are we just seeing nearby stars in the Orion Spur where we are? In the Sagittarius Arm? In the other direction, are we ...
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1answer
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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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371 views

Black hole at Galactic Center of the Milky way and Bar of stars?

The Milky Way is a barred spiral galaxy, with a supermassive black hole at its center. Here As it is a barred spiral galaxy, it has a central bar-shaped structure composed of stars.Here So my ...
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1answer
176 views

Get visible galactic longitudes in astropy

I would like to know which part of the Milky Way is currently up. Preferably using astropy. The ingredients I have are the current time, and my current position on earth. How would I use these to get ...
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1answer
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How did the object CO-0.40-0.22 get its name, and how is it distinct from CO-0.40-0.22*?

There seems to be three things described in the recent Nature Astronomy paper Millimetre-wave emission from an intermediate-mass black hole candidate in the Milky Way: Molecular cloud CO–0.40–0.22 ...
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2answers
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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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How do I see the milky way?

I've travelled to farms at night, and away from civilation. I don't really know alot about astronomy, but my goal is to see something like this: Stars, lots of them, but that "thick purple cluster of ...
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258 views

Would our galaxy appear as a spiral when seen from the Andromeda galaxy?

I'm wondering how our galaxy is tilted with respect to the Andromeda galaxy. Seen from the Andromeda galaxy, what would our galaxy look like? Would it appear as a spiral, or would it be seen ...
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551 views

Can Milky Way be seen in South hemisphere only?

I heard something(long time ago) that Milky Way can be seen in South hemisphere only, is it true? If so, what is the reason?
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Do most astronomers think that Andromeda will collide with Milky Way?

Most astronomers say it is likely to happen. Is this true? Are there any scientists that reject this?
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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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1answer
253 views

Why do we define the Milky Way's rotation in a left-hand coordinate system?

When we talk about Milky Way kinematics, we define it as rotating clockwise from top. In the rest of physics, rotating objects are defined as rotating counterclockwise from top (following the right-...
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1answer
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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362 views

Is it possible to figure out your location in the Milky Way if you are suddenly wormholed to a random, distant location in the galaxy?

If you were flying along in your spacecraft somewhere in our solar system and then a large, stable wormhole suddenly opened and you flew into it and were whisked away to some distant location in the ...
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1answer
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Have parameters been determined for the Fourier components of a Milky Way spiral density-potential model?

Spiral arms in galaxies can be modeled by potentials of the form $$\Phi_{\text{spiral}}(R,\theta,z,t)=\sum_mA_m(R,z)\cos(m\theta-m\theta_0-\phi_m(R)-\Omega_pt)$$ where $A_m(R,z)$ is the $m$th-order ...
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Why can I see the Andromeda Galaxy despite Milky Way's rotation?

Okay ... so, I woke up from a dream last night wherein I was (apparently) attempting to devise a time-keeping system for interstellar travel (similar to the stardate system used in Star Trek). In the ...
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1answer
376 views

Opposite Constellation of Sagittarius A*

Suppose an alien race fired a laser beam from the centre of the Milky Way, it went through the Sun and then off further out of the galaxy. What Constellation would the light beam head towards, ...
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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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How far is the Earth/Sun above/below the galactic plane, and is it heading toward/away from it?

How far is the Earth/Sun above/below the galactic plane, and is it heading toward/away from it? We know the Sun is orbiting the galactic center every 225 million years. But how far are we from the ...
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2answers
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What is radio-emitting gas? [closed]

What is radio-emitting gas? (I think it refers to the Magellanic Stream, but I can't be convinced.)
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Do we know if we are overtaking or falling behind our arm?

Here's our galaxy as best we know, courtesy of this Wikipedia article: It seems that as best we know, each arm is a compressed or brighter area (rather like a wave). Looking at that image, do we ...
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1answer
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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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1answer
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Why is the statement “black holes make up 1% of the mass of the Milky Way Galaxy” unknown?

a) We cannot detect all black holes and therefore don't know the percentage of the galaxy's mass they make up. b) We do not know the mass of the Milky Way's central black hole. c) According to our ...
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Are the stars outside of the galactic plane in the galactic halo?

The majority of the stars we see in the sky, like Pollux, are outside of the galactic plane. That means that all those stars we see are not in the galactic disk, and therefore are in the galactic halo,...
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Why don't we see “the milky way” in both directions?

We're (basically) in the middle of an arm of our galaxy. That is to say, we're sitting in the middle of a dense disc of stars. It would seem to me that. You should see: the thick line of the milky way ...
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1answer
2k views

How strong is the force between the Sun and the centre of the Milky Way?

I know the Sun is orbiting around the Milky Way, but how strong is the attractive force between them (e.g. what is the order of magnitude in terms of newtons)?