# Questions tagged [milky-way]

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

270 questions
Filter by
Sorted by
Tagged with
219 views

### What happens to planets as they cross the Galactic equator?

We know from research that the Solar System travels around the Galactic plane, and sometimes (periodically) dips below the Galactic equator, only to return and dip back above the Galactic equator ...
• 55
142 views

### Can someone provide an image that more reasonably shows what a human sees during ideal Milky Way viewing? Both land and sky

I recall seeing the Milky Way in 1987 from the edge of the Manzanar internment camp (Owens Valley, California). It was a Moonless night with perfectly clear skies and the location was (and still is) ...
• 767
71 views

### Double Schechter luminosity function for the Milky Way

I would like to calculate the density of MW-like galaxies using the double Schechter luminosity function: \$ \Phi(m) d m=\left[\phi_1\left(\frac{m}{m_*}\right)^{\alpha_1}+\phi_2\left(\frac{m}{m_*}\...
1k views

### Within the Milky Way, how much helium is made each second?

The Milky Way has 100-400 billion stars. Our sun is a fairly average example, and it converts 3.7× 10^38 protons to helium each second, through two different fusion pathways. I would like to know the ...
• 133
136 views

I am using a 1.4 meter parabolic dish with HPBW of 10 degrees and a RTLSDR to study our milky way in hydrogen line. The structure of the galaxy is deduced as shown in the picture by plugging the ...
• 115
1k views

### Realistic description of a sunrise viewed from the asteroid belt?

I'm writing a scene for a short story and wanted to describe a sunrise scene acurately. If someone was in some sort of craft in the asteroid belt and their craft was coming out from behind an asteroid,...
• 153
124 views

### Have gas or dust or rock accumulated in our solar system on its 20 orbits around the Milky Way?

Also,does the absence of the accumulation of anything large such as rogue planets by the solar system suggest the Milky Way has been orderly and stable for billions of years?
126 views

I'm a student, I am doing an investigation about S0-2. My idea was to take the wavelength that emanates from the star. When I saw the data from Science magazine I found a problem that was that the ...
112 views

### Motion of solar system around Milky Way

As our solar system performs its +-230 million year lap around the Milky Way, is the orientation of the ecliptic plane preserved independent of the center of our galaxy, or does the plane perserve its ...
• 21
390 views

### Dark Matter's effect on galaxy structure

One "fun fact" that's always been, well fun. Is despite what most assume, our sun does not orbit a supermassive black hole or any object at the center of our galaxy. Recently I read an ...
1 vote
150 views

### How did scientists decide the boundary of the Milky Way at Edwin Hubble times?

I know Edwin Hubble used Cepheid variables to prove the Andromeda Galaxy is not part of the Milky Way. But how did scientists at that time decide the boundary of the Milky Way? And how did they find ...
• 127
83 views

### How do we get -0.4 mJy/beam in the the 1.28 GHz MeerKAT Galactic Center Mosaic?

Dr. Becky's Feb. 11, 2022 video Move over JWST! 5 new telescopes to get excited for makes a quick mention of this image produced by the Meerkat array and published in Heywood et al. 2022 The 1.28 GHz ...
• 30.2k
196 views

### Are there any colored RAW photos of the Milky Way taken from space?

We can get RAW versions for many ISS images, like those of airglow, e.g. ISS043-E-143486. But all the photos of the Milky Way taken from ISS that I found were posted on Twitter (e.g. this, Flickr or ...
• 967
1 vote
75 views

### What Parts of the Observable Universe have we Observed?

Everyone talks about how big the observable universe is, all of the complexity, etc... But what parts of the observable universe have we actually seen? What Parts are hidden in relative shadows? Is ...
• 309
514 views

### Did the Grus star get expelled from the Milky way because it was accelerated by the Sagittarius A black hole?

On Wikipedia there is an article that says a star may have been expelled from the Milky Way because it interacted with Sagittarius A. Sagittarius A* from Wikipedia: In July 2019, astronomers reported ...
193 views

### Will the Milky Way galaxy revolve around the Andromeda galaxy or vice versa?

As all of you know, in the Milky Way galaxy, the Solar System revolves around the Milky Way to complete the Galactic year (because we have the supper massive black hole in our Milky Way galaxy) then ...
• 21
244 views

### Why does the Milky Way look as though it's lit from one side?

I was reading a good explanation of why we don't see the colors in the Milky Way with the naked eye, while even undoctored photos show some color. (It has to do with our colorblind rods.) But it got ...
• 101
1 vote
237 views

### Orbital decay of the sun's orbit around Sgr A*: is it likely?

What are the possibilities of the sun orbiting the black hole Sagittarius A* at a very close distance? Is there anything that could possibly alter the solar system's orbit, bringing it much closer to ...
• 657
1 vote
78 views

### Can we see the colorful patches or the strip of milky way galaxy with reflector telescopes?

As reflector telescopes gather light and make dimmer images brighter, so if I viewed through telescope with 1x magnification or viewed the horizon ,would I see the strip of milky way?
• 139
275 views

### Does the observed sky change when solar system passes through a spiral arm of Milky way?

According to density wave theorem, some other questions here [and my basic understanding from it] the spiral arms of an spiral galaxy are fixed regions of space around it with higher gravity, where ...
125 views

### can we fly a rocket past the black hole in the milky way? [closed]

Some information needed is facts about the black hole in a milky way.
57 views

### You find yourself on a random planet in the milky way 2000 years in the future. Can you figure out where/when you are? [duplicate]

Imagine you're on a planet in a distant part of the milky way, 2000 years from now. You don't know where you are or how much time has passed. You have access to modern astronomical data and technology ...
114 views

### Names of the galactic backdrop

I am wondering what are the various names given to the plane of the milky way. I am looking for a specific one I once heard, and will likely recognise when I see it. If I can explain better with a ...
• 701
3k views

### How much light would be received on a rogue planet close to the galactic center?

I was wondering if anyone has ever attempted to estimate how much solar radiation would be received on a rogue planet floating in between star systems close to the center of the milky way, compared to ...
4k views

### What happens when the quasar remnants reach Earth in 3 million years?

According to this article (A quasar Milky Way six million years ago?), during: (during) a quasar stage in its evolution (6 million years ago) ... the Milky Way’s central black hole swallowed a huge ...
• 409
3k views

### Is it possible for the Milky Way and Andromeda to get ejected upon colliding instead of merging?

The Milky Way and Andromeda are destined to collide and merge within the next 4-5 billion years, but I feel like there could be a chance that instead of merging, they could just eject each other. I ...
• 628
142 views

### If a supernova explodes all it's comets into space, can they reach a big number of star systems?

If there's DNA life that arises on a warm planet 2 billion years after the big bang, and meteorite collisions on the planet propagate DNA unicellular organisms into millions of icy rocks orbiting the ...
• 4,278
2k views

### Is the Andromeda galaxy larger than the Milky Way or not?

The Wikipedia article on the Milky Way states that it has an estimated 100 to 400 billion stars. The one on the Andromeda states that it has about a trillion stars. With this, we can conclude that the ...
• 315
73 views

### What could cause a wind from an SMBH

In this paper, the author tests whether the Milky Way's Fermi bubbles could have been caused by an AGN-type explosion, or by a 'wind'. He comes to the conclusion that the wind may be "the same as ...
• 2,620
52 views

### Are magnetic vortices capable of providing magnetic lensing when observed away from the poles

Magnetic vortices-(ESA cluster mission from observations November 2018)(article, ESA, science & exploration: 'Magnetic Vortices explain mysterious auroral beads'. An observer during Saturn's ...
• 49
2k views

### Where is the barycenter of the Milky Way Galaxy?

Is the barycenter of the Milky Way Galaxy located within the supermassive black hole, or its event horizon, at the center of our galaxy?
• 1,489
1 vote
44 views

### Curved milky way image [duplicate]

In today's microsoft bing https://www.bing.com/ background image the milky way is seen as curved. How is this possible?
• 1,477
143 views

### How many Milky Way stars in the Andromeda picture?

I am new to Astronomy, I got interested lately thanks to James Webb Space Telescope. I have some questions. In this zoomable picture of Andromeda galaxy, how many of our stars (Milky Way stars) in ...
• 263
897 views

### Early Milky Way depictions after Herschel?

We are all familiar with the 1785 drawing of the Galaxy by William Herschel, often quoted as the "First drawing of the Milky Way" Are there any other such historical drawings after this one?...
• 822
1 vote
84 views

### Does the north pole of the Solar System (with respect to the invariable plane) point towards the galactic center?

How is our Solar System as a whole (not the wobbly Earth) tilted with respect to the invariable plane of the Milky Way? I understand our Sun's north pole is largely pointing towards our direction of ...
• 5,367
2k views

### What are those stars that cross the galactic center?

I found this GIF by the European Southern Observatory (ESO) in the Wikipedia article on the galactic year, with the following description: Visualisation of the orbit of the Sun (yellow dot and white ...
• 1,677
1k views

### Finding Scorpius in the Milky Way panorama

I'm searching for the constellation of Scorpius in this image. Unfortunately this is a task too hard for a newbie like me, so I would like to have an hand about that.
• 181
1k views

### Depth of gravitational well within our local Virgo supercluster?

For simplicity we could imagine standing at the north pole so we do not have to care about how fast we are moving in relation to the gravitational field of the earth. Now calculating how much faster ...
• 457
683 views

### Great Attractor's gravity vs Universe Expansion

I would like to know if the trajectory of our galaxy has been calculated because it is usually said that the cosmos is emptying due to the expansion of the universe but at the same time there is a ...
360 views

### What is the apparent magnitude of the Milky Way from the viewpoint of the Large Magellanic Cloud?

Wikipedia contains the essentially unsourced claim that From a viewpoint in the LMC, the Milky Way's total apparent magnitude would be −2.0—over 14 times brighter than the LMC appears to us on Earth—...
3k views

### Why does a timelapse video of a stationary Milky Way make the horizon appear to move from horizontal to vertical?

In this video, with a rotating camera keeping the Milky Way 'stationary,' the horizon appears to transition form horizontal to nearly vertical. I understand the Earth ...
• 101
96 views

### how would you explain the motions in the solar system? [closed]

like so i don't get it it does not make sense I'm confused
2k views

### How was the speed of the Sun (around the Milky Way Galaxy) calculated?

The Sun travels around the Milky Way Galaxy with a speed of 220 km/s. The question is: where did this value come from? Is there any article about the calculation? Reformulated question: What are the ...
803 views

### How many stars are in the Milky Way galaxy?

So, I've always heard that the Milky Way hosts between 100 billion to 400 billion stars. My problem is very simple: I'm unable to find any research papers on that topic or giving those estimates. I'm ...
• 3,926
1 vote
192 views

### If all objects move, where do we go?

Yes I know that the sun and planets in the solar system travel fast with an average speed of 448,000 mph. Are we going to the center of the galaxy? If so, does that mean our galaxy is getting smaller ...
• 113
327 views

### How well have we mapped our local neighborhood of stars?

Do we have a reasonable idea of how well we've mapped our local neighborhood of stars? That is, about what fraction we know about vs. what fraction are unseen (too dim, too much dust, not enough ...
• 383
681 views

### Are there black holes and neutron stars in satellite dwarf galaxies orbiting around Milky Way?

It is thought that the number of satellite dwarf galaxies orbiting around Milky Way is counted in hundreds. Are there black holes and neutron stars in satellite dwarf galaxies orbiting around Milky ...
• 711
860 views

### What is the (overall) half-mass radius of Milky Way

I am doing some simulation and I need the half-mass radius of Milky Way (total mass: including all objects, dark matter, nebula...), but I cannot find the value and I don't know how to calculate it. I ...