/r/Astronomy

Photograph via snooOG

The amateur hobby of humanity since the dawn of time and scientific study of celestial objects.

Everything to do with Astronomy

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"Astronomy compels the soul to look upward, and leads us from this world to another."

"We are a way for the cosmos to know itself."

Answers to Common Questions

How do I Become an Astronomer/What do Astronomers Do?

What telescope/accessories should I buy?

What should I look for in the sky?

What Was That Bright Moving Object I Saw?

Where Can I Learn About Astronomy?

Can I Get Help With Homework?

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/r/Astronomy

2,901,549 Subscribers

1

Moonset and Stargazing

I'll be visiting Haleakala in Maui to stargaze in the evening on April 4th. Moonset on that day is 2:51 PM. Does that mean by evening time (lets say 7-8 PM), viewing conditions will be equivalent to that of a new moon?

Alternatively, I can try adjust my schedule and attempt to visit Haleakala April 5th or 6 when its closer to a new moon. Would have to cancel reservations for other scheduled things though. Any insight is appreciated! TIA.

2 Comments
2024/03/30
16:03 UTC

28

City lights create a golden path of light through star trail imagery from the ISS. More details in comments.

1 Comment
2024/03/30
13:40 UTC

45

Updated weather forecast for Eclipse

22 Comments
2024/03/30
13:34 UTC

235

I’ve come to realize there are literally millions of people out there who think they’ve seen a total solar eclipse, but only saw a 95-99.9% partial eclipse

Astronomer here! I’ve had this conversation many times in the past week (even with my mother!)- person tells me they “happened to be in the path” of a total solar eclipse and saw it, and then proceeds to tell me a location that was very close to but not exactly in the path of totality- think Myrtle Beach, SC in 2017, or northern Italy in 1999. You can also tell btw because these people don’t get what the big deal was and why one would travel to go see one.

So if you’re one of those folks wanting to post “if I’m at 97% is it worth driving for totality,” YES! Even a 99.9% eclipse is still 0% totality, and the difference is literally that between night and day! Trust me, I’ve seen a lot of amazing things in my life, and the coolest thing I’ve ever seen was a total solar eclipse.

Good luck to everyone on April 8!

Edit: for totality on the eclipse on April 8, anywhere between the yellow lines on this map will have totality, but it will last longest at the red line.

70 Comments
2024/03/30
13:13 UTC

0

The expanding universe

I was recently thinking about the fact that the universe is expanding and what that means. To me, there are to ways to view this,

  1. things are getting farther away,

or 2. new things are appearing that we couldnt see before.

Option one is what i have assumed and thought and seems ti be the common narrative. However, how did we end up seeing everything we currently see?

Have we always “seen” the things we can currently but been expanding away from those things we can see?

By see i mean have in our observable universe.

Secondly. If the universe is expanding but no new things are being revealed in that expansion, that either means we can always see everything, just increasingly in the past? Or are we somehow expanding in additional dimensions that mean that those new things that could be revealed are not as they are expanding along new dimension lines never catching us?

By catching us i mean entering the observable universe.

Do I have a misconception somewhere? What does or does not work with my ideas? Am i completely off base?

Thanks for everyones time!

5 Comments
2024/03/30
12:45 UTC

113

The 10-day forecast (wunderground) for Eclipse Day is here, and there will be a lot of clouds

48 Comments
2024/03/30
09:47 UTC

0

Satellite flare?

To preface I am not and have never been an astronomer of any sort. I like being subbed to this sub because you guys see and post and talk about a lot of cool stuff.

At around 9:10pm tonight in central North Carolina I looked up and saw a plane. I’m a pilot as a hobby so I tend to stare at things in the sky a lot. Adjacent to the plane was another dot, with only a single light(white/blueish white in color), no nav lights, traveling north(ish) to south(ish). It looked to be traveling slower than I’ve seen satellites in the past. After following it for about 10-15 seconds it seemed to just disappear. Not really dim or fad but just go away. As far as I could tell it was a perfectly clear sky. The object didn’t have a tail behind it. Just a dot. Could this be a satellite flair? Or what might it have been had it not been that? Just curious and not looking to start a ufo discussion just genuinely curious what I saw. Thanks!

7 Comments
2024/03/30
01:23 UTC

645

First telescope!

35 Comments
2024/03/29
20:03 UTC

0

Totallity plans fell through. Last-minute flights possible?

I care nothing about where I'm going in terms of other attractions. I want to fly out Sunday from NYC and come back after the eclipse. Any leads on a destination with tickets that aren't astronomically ;) high?

Update: Borrowed a friend’s car, found another friend to crash with. Traffic is gonna be bonkers!

34 Comments
2024/03/29
18:22 UTC

8

I see on NASA's animation that in the farther down path of totality the shadow is oblong shaped (because of the angle). How does this effect the experience if in area that gets hit with the oblong shadow?

20 Comments
2024/03/29
17:31 UTC

1

Find a use for counterfit solar eclipse glasses

I looked a bit online, but can only find warning about fake eclipse glasses (understandably). I acquired a pair of obviously non certified eclipse glasses (they show the iso code, but have none of the required identification). I got them fairly cheap, so I was debating if I should just return them or if I could use them on my phone camera/canon camera with a cardboad contour to take pictures... Maybe by making them double or something. I compared them to actual certified glasses by wearing them and pointing my phone light directly at my eyes and it's not THAT bad of a counterfit. They let a bit more light trough, but it's not as bad as what I've seen on the internet for some other fakes. So, would you think they would be safe for my camera or would they ruin my equipment?

20 Comments
2024/03/29
16:01 UTC

102

Witness the Devil's Comet

12 Comments
2024/03/29
14:57 UTC

156

ISS Transiting the Sun on March 28th, 2024

9 Comments
2024/03/29
14:05 UTC

51

Would travelling from 93% to the path of totality still be worth it if it ends up being cloudy?

I really want to go regardless to experience the darkness but the person I want to go with wont stop bringing up "it'll probably be cloudy". How big of a deal is the experience without getting to see the corona if it is cloudy but still getting to experience the darkness?

49 Comments
2024/03/29
01:13 UTC

12

Solar eclipse question.

I was just about to order solar lenses for my binoculars for the eclipse, and it donned on me that I have glasses. Can I just wear the glasses and look through the binoculars?

23 Comments
2024/03/28
23:52 UTC

5

Same Day RT Flight For Totality

Sorry for another eclipse post... I drove all-day to get reach the totality zone for the 2017 eclipse only to get severely clouded over. It got dark and everything etc..., but the clouds moved in and were way too dense to fully enjoy the experience. My wife won't let me take the kids out of school "for science" and this is a bucket list item for me.

The FAA is talking about flight delays, but I'm thinking about taking an early flight to the mid-west, literally walking outside of the airport, watching the eclipse, and then hopping on my flight back home. I guess the airlines caught onto this as the flights a few hours after the eclipse are magically 3x more than usual.

Dallas, Little Rock, Indianapolis, and Cleveland are all in the path of totality. Intuition tells me my chances of a clear sky are probably better off further south in Dallas or Little Rock, but the 10 day forecast is already looking a bit murky for all of these areas. One single cloud can ruin the full totality experience, but if you were me, where would you roll the four sided dice? Worst case, I just cancel my flight and get my money back the day before.

7 Comments
2024/03/28
22:35 UTC

383

Messier 27 on film slide from Hale 200” telescope in 1961

Was sent a couple of these by a friend after he nabbed them on eBay! Super cool to own a piece of history

9 Comments
2024/03/28
21:17 UTC

57

Questions about the "Pale Blue Dot" photograph

I've been fascinated by the "Pale Blue Dot" photograph taken by the Voyager 1 space probe in 1990 ever since it was released. I know it's part of the Family Portrait series of images of the Solar System.

Were plans of this photo announced to the public before it was taken by Voyager 1 the way it was done in 2013 when we were asked to look up at the sky and smile when the Cassini spacecraft took a photo of Earth while exploring Saturn ("The Day the Earth Smiled")?

According to https://photojournal.jpl.nasa.gov/catalog/PIA23645 the photo was taken at 4:48 GMT on Feb. 14, 1990. Which side of Earth is seen in this photo?

Bonus question: Which side of Earth is seen in "The Day the Earth Smiled"?

Thanks a lot in advance!

11 Comments
2024/03/28
16:45 UTC

57

Is there a difference within the zone of totality during the eclipse?

If you already live within the zone of totality for the eclipse is it worth getting as close to the center line as possible or if you're within the zone of totality is the experience more or less the same everywhere?

23 Comments
2024/03/28
13:47 UTC

3

How visible is Lyrids meteor shower compared to Perseids? And when will be the peak in Abu Dhabi?

Hello! Sorry I am a noob when it comes to astronomy but always had an interest. I am planning a camping trip with my buddies into the heart of the Abu Dhabi Desert and camp the night to see the shower. Will it be worth it? It’s a 3-4 hour drive with 2h across dunes. Will camp the night and return in the morning. We have the cars for it as we usually go dune bashing.

1 Comment
2024/03/28
09:20 UTC

189

How does one edit/process a moon picture like this?

Is there a tutorial out there somewhere? I've tried to look for it but wasn't successful so I'd really appreciate if you could help me!

16 Comments
2024/03/28
08:03 UTC

72

Here's something to take notice of during the eclipse

I'm sure most know this, but there's a thing called a pinhole camera you can view the sun through. You take a stiff sheet of paper and put a small hole in it. Not literally a pinhole, but small like a pencil point. Let the Sun shine through it onto another sheet of paper, and it will make an image of the Sun. The small hole only allows the rays coming directly at it through and act like a projector.

Now here's the fun part! During the eclipse, if you're around any trees with leaves and the sun is shining through the breaks in the leaves onto pavement or flat surfaces, check out the shadows. Each of those little parts where the Sun peeks through breaks in the leaves will be a small projection of the eclipse. I noticed it during the last one when I was outside watching it. I happened to look down and saw the shadows from the trees looked very odd. It helps if there's lots of little breaks in the leaves so lots of patches of Sun peek through. It was a fun phenomena.

6 Comments
2024/03/28
04:30 UTC

3

Are toroidal stars possible?

I know that toroidal planets are theoretically possible, but how about stars? What would some of their properties be? What would happen when they die? How about toroidal white dwarfs, or neutron stars?

21 Comments
2024/03/28
02:45 UTC

10

Zone of Totality worth traveling?

Hi,

I’m in a 90% coverage zone for the Eclipse, but am a day drive (4 hours) away from the zone of totality. I don’t know much about Astronomy.

Would the drive be worth it?

Thanks in advance

44 Comments
2024/03/28
00:44 UTC

4

Celestron nexstar 4se, which filter to get for the upcoming eclipse?

Hey all, Just looking for some insight here. Which filter do you reccomend I use to be able to safely view and photograph the eclipse? Funny enough, celestron support said "ask an astronomy store".

5 Comments
2024/03/27
23:11 UTC

6

Will the comet 12P/Pons-Brooks be visible with the naked eye during the 2024 solar eclipse?

7 Comments
2024/03/27
22:31 UTC

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