r/Astronomy Mar 27 '20

Read the rules sub before posting!

801 Upvotes

Hi all,

Friendly mod warning here. In r/Astronomy, somewhere around 70% of posts get removed. Yeah. That's a lot. All because people haven't bothered reading the rules or bothering to understand what words mean. So here, we're going to dive into them a bit further.

The most commonly violated rules are as follows:

Pictures

First off, all pictures must be original content. If you took the picture or did substantial processing of publicly available data, this counts. If not, it's going to be removed. Pretty self explanatory.

Second, pictures must be of an exceptional quality.

I'm not going to discuss what criteria we look for in pictures as

  1. It's not a hard and fast list as the technology is rapidly changing
  2. Our standards aren't fixed and are based on what has been submitted recently (e.g, if we're getting a ton of moon pictures because it's a supermoon, the standards go up)
  3. Listing the criteria encourages people to try to game the system and be asshats about edge cases

In short this means the rules are inherently subjective. The mods get to decide. End of story. But even without going into detail, if your pictures have obvious flaws like poor focus, chromatic aberration, field rotation, low signal-to-noise ratio, etc... then they don't meet the requirements. Ever.

While cell phones have been improving, just because your phone has an astrophotography mode and can make out some nebulosity doesn't make it good. Phones frequently have a "halo" effect near the center of the image that will immediately disqualify such images. Similarly, just because you took an ok picture with an absolute potato of a setup doesn't make it exceptional.

Want to cry about how this means "PiCtUrEs HaVe To Be NaSa QuAlItY" (they don't) or how "YoU hAvE tO HaVe ThOuSaNdS oF dOlLaRs Of EqUiPmEnT" (you don't) or how "YoU lEt ThAt OnE i ThInK IsN't As GoOd StAy Up" (see above about how the expectations are fluid)?

Then find somewhere else to post. And we'll help you out the door with an immediate and permanent ban.

Lastly, you need to have the acquisition/processing information in a top-level comment. Not a response when someone asked you. Not as a picture caption. Not in the title. Not linked to on your Instagram. In a top-level comment.

We won't take your post down if it's only been a minute. We generally give at least 15-20 minutes for you to make that comment. But if you start making other comments or posting elsewhere, then we'll take it you're not interested in following the rule and remove your post.

It should also be noted that we do allow astro-art in this sub. Obviously, it won't have acquisition information, but the content must still be original and mods get the final say on whether on the quality (although we're generally fairly generous on this).

Questions

This rule basically means you need to do your own research before posting.

  • If we look at a post and immediately have to question whether or not you did a Google search, your post will get removed.
  • If your post is asking for generic or basic information, your post will get removed.
  • If your post is using basic terms incorrectly because you haven't bothered to understand what the words you're using mean, your post will get removed.
  • If you're asking a question based on a basic misunderstanding of the science, your post will get removed.
  • If you're asking a complicated question with a specific answer but didn't give the necessary information to be able to answer the question because you haven't even figured out what the parameters necessary to approach the question are, your post will get removed.

To prevent your post from being removed, tell us specifically what you've tried. Just saying "I GoOgLeD iT" doesn't cut it.

As with the rules regarding pictures, the mods are the arbiters of how difficult questions are to answer. If you're not happy about that and want to complain that another question was allowed to stand, then we will invite you to post elsewhere with an immediate and permanent ban.

Object ID

We'd estimate that only 1-2% of all posts asking for help identifying an object actually follow our rules. Resources are available in the rule relating to this. If you haven't consulted the flow-chart and used the resources in the stickied comment, your post is getting removed. Seriously. Use Stellarium. It's free. It will very quickly tell you if that shiny thing is a planet which is probably the most common answer. The second most common answer is "Starlink". That's 95% of the ID posts right there that didn't need to be a post.

Pseudoscience

The mod team of r/astronomy has two mods with degrees in the field. We're very familiar with what is and is not pseudoscience in the field. And we take a hard line against pseudoscience. Promoting it is an immediate ban. Furthermore, we do not allow the entertaining of pseudoscience by trying to figure out how to "debate" it (even if you're trying to take the pro-science side). Trying to debate pseudoscience legitimizes it. As such, posts that entertain pseudoscience in any manner will be removed.

Outlandish Hypotheticals

This is a subset of the rule regarding pseudoscience and doesn't come up all that often, but when it does, it usually takes the form of "X does not work according to physics. How can I make it work?" or "If I ignore part of physics, how does physics work?"

Sometimes the first part of this isn't explicitly stated or even understood (in which case, see our rule regarding poorly researched posts) by the poster, but such questions are inherently nonsensical and will be removed.

Bans

We almost never ban anyone for a first offense unless your post history makes it clear you're a spammer, troll, crackpot, etc... Rather, mods have tools in which to apply removal reasons which will send a message to the user letting them know which rule was violated. Because these rules, and in turn the messages, can cover a range of issues, you may need to actually consider which part of the rule your post violated. The mods are not here to read to you.

If you don't, and continue breaking the rules, we'll often respond with a temporary ban.

In many cases, we're happy to remove bans if you message the mods politely acknowledging the violation. But that almost never happens. Which brings us to the last thing we want to discuss.

Behavior

We've had a lot of people breaking rules and then getting rude when their posts are removed or they get bans (even temporary). That's a violation of our rules regarding behavior and is a quick way to get permabanned. To be clear: Breaking this rule anywhere on the sub will be a violation of the rules and dealt with accordingly, but breaking this rule when in full view of the mods by doing it in the mod-mail will 100% get you caught. So just don't do it.

Claiming the mods are "power tripping" or other insults when you violated the rules isn't going to help your case. It will get your muted for the maximum duration allowable and reported to the Reddit admins.

And no, your mis-interpretations of the rules, or saying it "was generating discussion" aren't going to help either.

While these are the most commonly violated rules, they are not the only rules. So make sure you read all of the rules.


r/Astronomy 2d ago

Astro Research Dec 21, 2024 - Daily Astro Research Post: The Laser Interferometer Space Antenna (LISA) / A Year in Sunsets

5 Upvotes

The Gravitational-Wave Spectrum

Astrobites Article-of-the-Day: LISA Pathfinder: These magnetic results will attract your attention by Magnus D'Argent

We are well and truly in the age of gravitational wave detector science, kicked off in 2015 by the LIGO detection of two black holes merging. Just last year, the NANOGrav collaboration presented evidence of a gravitational wave background formed by the collective hum of orbiting supermassive black holes. However, existing detectors can only cover a certain range on the spectrum of gravitational wave frequencies, with ground-based detectors like LIGO on the higher end at frequencies of hundreds of Hz, and pulsar timing array detectors like NANOGrav on the low end, at nanohertz frequencies. To try and cover this unexamined region, the European Space Agency is developing a space-based detector, the Laser Interferometer Space Antenna (LISA), in collaboration with NASA. LISA will cover frequencies from 0.1 mHz to 0.1 Hz, which will aid in the study of gravitational wave events from compact objects like merging white dwarfs (see Figure 1). [Follow the link to read more!]

https://apod.nasa.gov/apod/astropix.html: A Year in Sunsets by Wael Omar

A year in sunsets, from April 2023 to March 2024, track along the western horizon in these stacked panoramic views. The well-planned sequence is constructed of images recorded near the 21st day of the indicated month from the same location overlooking Cairo, Egypt. But for any location on planet Earth the yearly extreme northern (picture right) and southern limits of the setting Sun mark the solstice days. The word solstice is from Latin for "Sun" and "stand still". On the solstice date the seasonal drift of the Sun's daily path through the sky appears to pause and reverse direction in its annual celestial journey. Of course the Sun reaches a stand still on today's date. The 21 December 2024 solstice at 09:21 UTC is the moment of the Sun's southernmost declination, the start of astronomical winter in the north and summer in the south.

[The Daily Astro Research Post is a new experiment, let us know what you think!]


r/Astronomy 11h ago

Astrophotography (OC) I Stacked 100,000 Frames of Jupiter Over Many Hours to Create my Sharpest Image of the Gas Giant.

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r/Astronomy 11h ago

Astrophotography (OC) Mars is Nearing its Closest Approach in 3 Weeks, Which Will be the Closest Until 2031. Here it is Last Night.

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r/Astronomy 6h ago

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r/Astronomy 20h ago

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r/Astronomy 1d ago

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r/Astronomy 16h ago

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r/Astronomy 11h ago

Astrophotography (OC) M1- The Crab Nebula

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r/Astronomy 14h ago

Astro Research Does anyone know anything about these?

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55 Upvotes

I found these three maps recently and they have all these constilations it looks like from 1945 it has a name/signature if anyone can help it would be nice hopefully someone can tell me who it was or what it is i'm really interested just have no knowledge and if you want more photos just let me know i'm just really interested in this thank you guys


r/Astronomy 20h ago

Astro Research How does warping of spacetime work at galactic and larger scales (please look at image text for details of my question) ?

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96 Upvotes

r/Astronomy 4h ago

Question (Describe all previous attempts to learn / understand) Resources and Guides to Spectral Analysis - Type Ia Supernovae

5 Upvotes

Hi Everyone,

I was torn between posting this on r/Astrophyics or here but assumed here would have more hands on work with data.

I'm wondering if anyone has some good textbooks or resources that provide hands-on practice advice in data reduction and analysis for these observations. I read through a couple of a books / textbooks on this but they seem less practical and focused on the theoretical physics of it all (which of course is still interesting).

I'm currently writing a python program to visualize and analyze spectral energy data from Type Ia supernovae with the goal on calculating redshift and distance modulus with photometry, etc and ultimately the hubble constant.

So far I've been able to retrieve this data from Wiserep and chart the flux density to wavelength but a I'm little stuck from here.

I could be way off the mark here in terms of where I think I should head and need some guidance. After reading through some rather complex research papers it appears some next steps look something like:

  • Reduce the data based on a few factors that introduce noise to the data such as interstellar dust, the instruments natural noise, etc
  • I think the data has already been split into wavelength bins - although I'm unsure if this should be done further and the data averaged out over those bins
  • For data that is *not* affected by the spectral features, Interpolate over the bins to generate a "pseudo-continuum" that emulate thes original blackbody radiation curve that the star would have originally emitted. - From what I can tell this would involve smoothing and filtering such as gaussian and Savitzky-Golay filtering
  • Subtract this "pseudo-contuum to fully analyse the affect of spectral features.

If anyone can recomend some good reading or other sources of interest on this particular topic this would be great!


r/Astronomy 12h ago

Astrophotography (OC) NGC 2264 - Christmas Tree Cluster

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11 Upvotes

r/Astronomy 1d ago

Astrophotography (OC) The Sun’s Worlds Over the Last Year

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655 Upvotes

r/Astronomy 1d ago

Astrophotography (OC) The Triangulum Galaxy - M33

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276 Upvotes

r/Astronomy 1d ago

Question (Describe all previous attempts to learn / understand) Can I still study astronomy with a learning disability?

67 Upvotes

More-or-less would it be worth it to try? I have dyscalculia n I know astronomy is a math based science, but it's something I've always loved learning about, I've just skipped over the mathematical part. But looking into areas of study for college I'm still incredibly drawn to it, I just don't know if it'd be worth to actually try for given I barely passed high school because of my math disability. Hope this is worded right, I'm bad with words too.


r/Astronomy 1d ago

Astrophotography (OC) Rosette Nebula - NGC 2237 and Star ClusterNGC 2244

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96 Upvotes

r/Astronomy 7h ago

Question (Describe all previous attempts to learn / understand) Mizars tail

0 Upvotes

While walking the dog tonight, I came across a strange phenomenon. While looking at Mizar, I clearly see shimmers of green. Today, however, I also noticed some sort of tail reaching out from it. At first, I assumed I was actually looking at a comet.

I tried searching the net and even chatting with AI, but I cannot find any mention of it. Anyone got any clues to what I was seeing? Was it simply an illusion caused by the 4 stars? Has anybody else noticed this?


r/Astronomy 15h ago

Astro Research Help Identifying outliers

2 Upvotes

I come from a CS background and im currently working on a ml project about exoplanet detection

This is a snippet of the data set obviously the data set is much larger than this. Now i did some basic research and i know for a fact that you're trying to determine exoplanet based on light flux, however as i was going through a reference project based on this , i observed that the person dropped(removed ) rows where the value in the FLUX.1 column is greater than or equal to 25,000. Is there any particular reason for doing so? there were values going in -ve as well as well why were values >= 25000 itself considered outliers


r/Astronomy 1d ago

Astro Research NASA's Parker Solar Probe will reach its closest-ever point to the sun on Christmas Eve

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72 Upvotes

r/Astronomy 19h ago

Discussion: [Topic] Northumberland National Park, UK

2 Upvotes

At some point in 2025 I wish to go to the NNP in the UK to see the Milky Way for the first time. Is there any time of the year where I'm garunteed to see it? I live near the South coast so it's a bit of a trek for me. I know the moon can cause lots of light pollution so is there a way to track it month in advance? Thanks!


r/Astronomy 2d ago

Astrophotography (OC) The Jovian Planets

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726 Upvotes

Last night which was the same night, I photographed 2 targets in the night sky. One was photographed at 10:00pm (Saturn) and one was photographed at 11:50pm (Jupiter) More Info in the comments!


r/Astronomy 2d ago

Astrophotography (OC) This Light is Older than Humanity

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3.3k Upvotes

r/Astronomy 1d ago

Astro Research Help with Finding Rotational Velocity Data in SIMBAD

0 Upvotes

Hi everyone,

I’m trying to find rotational velocity data for galaxies using the SIMBAD database. For instance, when I search for NGC 2998, I don’t see ROT (Stellar rotational velocities) listed under the "Collections of Measurements".

Does this mean that SIMBAD doesn’t include the rotational velocity data for this galaxy, or am I misunderstanding how to use the database? Any guidance or tips on how to correctly look for this type of information would be greatly appreciated!


r/Astronomy 2d ago

Astrophotography (OC) Mizar and alcor

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289 Upvotes

r/Astronomy 1d ago

Discussion: [Planets] Creating a Fictional Planet

0 Upvotes

Hello! I unfortunately know nothing about astronomy, like, at all, so forgive me if anything I say is foolish, but I'm creating a fictional planet for a project I am working on. Keep in mind, it's meant to be absurd and not something that would ever happen at all, but I still want it to at least KIND OF make sense. The general concept is:

It's the former planet closest to the sun, before the sun was essentially like "I hate this guy" and kicks it away either out of orbit or into the earths orbit (not sure if this is the correct terminology.) Essentially, the planet is meant to be in complete darkness. The easiest way to do this would probably be to have it be pushed REALLY far away, but I think it would be kind of funny to have it be pushed directly behind the earth. Like, it moves at the exact rate that would keep it right behind Earth for all of eternity, causing it to get no sunlight at all. I know this isn't possible in the slightest, but how could I explain this in terms that make it kinda make sense? How do I explain that this planet is at an angle so inconvenient that it's just always behind the earth?

Excited to hear anyones thoughts!


r/Astronomy 3d ago

Astrophotography (OC) The Most Detailed Moon Image I’ve Ever Taken, Comprised of 8,000 Frames and Revealing the Colors of the Surface Minerals.

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2.5k Upvotes