Is it possible to see the stars in the sky?

  • Thread starter Thread starter angel 42
  • Start date Start date
  • Tags Tags
    Stars
AI Thread Summary
The discussion revolves around the concept of "seeing" stars and the sun, focusing on the physics of light and perception. Participants explore whether observing celestial bodies means seeing them as they are in the present or as they were in the past due to the time it takes for light to reach Earth. The conversation touches on relativity, noting that when looking at stars, one is seeing light emitted long ago, with some stars possibly no longer existing. The idea that perception is influenced by distance and time is emphasized, leading to debates about the nature of "seeing" and whether it is meaningful to consider the past light when discussing visibility. The thread also humorously diverges into personal anecdotes and philosophical musings about perception and reality, ultimately questioning the shared experience of seeing among individuals.
angel 42
Messages
25
Reaction score
0
can you see the stars?

hi, can anyone of you look and see the stars, for example, can you see the sun?
kind of a puzzle:confused:
lets see what do you think
 
Physics news on Phys.org
I don't have wireless, so I'm stuck inside, and all I can see through the window is... trees, flowers and grass. Already not that bad actually :smile:

Did they move the stars lately, or why do you inquire ?
 
We had some bad thunderstorms lately so I doubt I can see anything. I'm not going out to look, but I can't see stars/sun from my window.
 
Did they move the stars lately, or why do you inquire ?[/QUOTE]


it's a 100% physics talking, there's a point just think
 
Are you trying to figure out whether or not we're aware that the Sun is a star? :rolleyes:

- Warren
 
chroot said:
Are you trying to figure out whether or not we're aware that the Sun is a star? :rolleyes:

- Warren


WHAT! No, I thought it was a giant Planter's Cheese Puff!:biggrin:
 
chroot said:
Are you trying to figure out whether or not we're aware that the Sun is a star? :rolleyes:

no I'm not, I know as you do that the sun is a star and there are other 10000000... stars, but my Q is when you go out and look at that round sun do you think that you are seeing it really?

lets figuer out who's the cliver here
 
angel 42 said:
lets figuer out who's the cliver here

I think I have that sussed :rolleyes:
 
angel 42 said:
no I'm not, I know as you do that the sun is a star and there are other 10000000... stars, but my Q is when you go out and look at that round sun do you think that you are seeing it really?

lets figuer out who's the cliver here
You're seeing it approx. 8 minutes later.
 
Last edited:
  • #10
Yes when I look at the sun I think that I'm really seeing it. Except for the perceived size that's smaller than actual due to the sun being far away. I'm confused :confused:.
 
  • #11
I think Evo cracked it. It all makes sense now.
 
  • #12
By the definition of "seeing", i.e. your eyes are receiving light from the object and your brain is processing it, you do see the sun.

I am lost at where this is going??:confused:
 
  • #13
G01 said:
By the definition of "seeing", i.e. your eyes are receiving light from the object and your brain is processing it, you do see the sun.

I am lost at where this is going??:confused:
When you look at a star, you are seeing the light that it gave off in the past, how long ago depends on the distance. Some stars that we "see" today may no longer exist.
 
  • #14
Well, the theory of relativity abolishes the notion of absolute time. It is meaningless to ask about the state of a distant object "right now," as the concept of "right now" doesn't extend beyond your own frame of reference.

- Warren
 
  • #15
angel 42 said:
chroot said:
my Q is when you go out and look at that round sun do you think that you are seeing it really?
When you put it that way, the answer is definitely yes. When I go out and look at that round sun, I think that I am seeing it really. Do you think am I really looking at that round sun?
 
  • #16
Evo said:
You're seeing it approx. 8 minutes later.

bingo, but still missing a part of the correct answer what do you see??
 
  • #17
chroot said:
Well, the theory of relativity abolishes the notion of absolute time. It is meaningless to ask about the state of a distant object "right now," as the concept of "right now" doesn't extend beyond your own frame of reference.

- Warren
What if the distant star is stationary in my frame?
 
  • #18
angel 42 said:
bingo, but ...
Bingo is played differently in my neighborhood.
 
  • #19
jimmysnyder said:
What if the distant star is stationary in my frame?

The Sun is not stationary in your frame.

- Warren
 
  • #20
When you put it that way, the answer is definitely yes. When I go out and look at that round sun, I think that I am seeing it really. Do you think am I really looking at that round sun?[/QUOTE]



no I and you aren't looking at it? :wink:
 
  • #21
angel 42 said:
bingo, but still missing a part of the correct answer what do you see??
I see dead people

Light?
 
  • #22
angel 42 said:
no I and you aren't looking at it? :wink:
When I am not looking at the sun, I don't see it.
 
Last edited:
  • #23
Light?[/QUOTE]

no, :rolleyes:
 
  • #24
angel 42 said:
hi, can anyone of you look and see the stars, for example, can you see the sun?

I asked my niece, and the answer is an unqualified 'no'. Then again, she's stone blind. :rolleyes:
 
  • #25
Evo said:
I see dead people

Wow, post 21. That's pathetic, guys.

I want to know: have you ever seen the rain?
 
  • #26
I can't see the sun or the ocean or the trees... They are all hiding underneath their surface.
 
  • #27
russ_watters said:
I want to know: have you ever seen the rain?
OK, I want to know who is REALLY cliver. I mean you are going to have to be so cliver to get this.

Do you (you!) feel like I do ?

Think about that for a while, as I pat mself on the back.

(Evrone here try to learn a little physicis an be not so defenisiv)
 
Last edited:
  • #28
russ_watters said:
. . .I want to know: have you ever seen the rain?

I have. It was coming down on a sunny day. Oh and. . .Yeah!

As for the original post, I often wonder if everyone "sees" things the same. In school once, I colored in a picture and made my sun yellow. It looked right to me. The child next to me made his sun black and then told me mine was wrong. We have the physical side of the question (light and the movement of the object through space and time), but then there is the biological and psychological sides (perception). Do we all perceive the sun the same? I don't know.
 
Last edited:
  • #29
russ_watters said:
Wow, post 21. That's pathetic, guys.

I want to know: have you ever seen the rain?

Better than that. I've seen the snow on a sunny day ... in June (we've had a really strange summer - I've never seen this much snow on Pikes Peak this late in the year and a lot of the mountain jeep trails are still impassable due to snow).

The only problem I have with the original post is that there's nothing really special about seeing the Sun. You see it the same way you see anything else and it always takes time for light to pass from the object you're seeing to you.

So, either the delay is a natural part of 'seeing' something and we do see the Sun, or else you're rendering the word 'seeing' useless, 'feeling' useless, 'hearing' useless, etc, since you always perceive something in the past vs. the present.
 
  • #30
Of course you don't see the whole sun... the blue portion is spread throughout the sky, so when looking at the sun you only see a portion of it, because a portion of it (evenly spread throughout) can actually be seen where you aren't looking
 
  • #31
russ_watters said:
Wow, post 21. That's pathetic, guys.

I want to know: have you ever seen the rain?
Hey, watch who you call pathetic. At least I knew where he was going with the elapsed time.
 
  • #32
OK so I don't really get the point of this thread, but since it is started already...

When I look in the direction of the stars I collect light that is emitted by it. This is a very small portion of all the radiation, first a small part of the electromagnetic spectrum, second ignoring all matter radiation, so I collect only a very limited amount of information. On top of that, the visible electromagnetic spectrum emitted by the star is not necessarilly the same as the one received at the level of the ground on Earth. But let us concentrate only on the visible part of the electromagnetic spectrum just outside the star, ignoring the time it takes to travel and the redshift it undergoes so doing, ignoring again the diffusion it undergoes in the atmosphere of the Earth... This radiation is not strictly emitted by the entire star, but rather only the photosphere, the region where it becomes transparent to the part of the spectrum we are talking about here.

Am I getting closer to what you expect ?
 
  • #33
Evo said:
When you look at a star, you are seeing the light that it gave off in the past, how long ago depends on the distance. Some stars that we "see" today may no longer exist.

I knew about this, but I'm still lost at where this thread is going. Since if this was the complete answer it would be over by now! I really want to know the answer to this...
 
  • #34
G01 said:
I knew about this, but I'm still lost at where this thread is going. Since if this was the complete answer it would be over by now! I really want to know the answer to this...
I have no clue what he's looking for either. It's like me asking...what am I thinking of when I think of the sun? :rolleyes:
 
  • #35
chroot said:
Well, the theory of relativity abolishes the notion of absolute time. It is meaningless to ask about the state of a distant object "right now," as the concept of "right now" doesn't extend beyond your own frame of reference.
Now you're talking. :biggrin:
 
  • #36
you are seeing the past, you are seeing history. everything we see is what was , not what is. Our processing is not fast enough to see now..only then.
 
  • #37
hi, you are seeing a ""place"" or position of that star at some time from the past, which you all will agree with that. BUT CAN YOU BELIEVE that this was noted in a book that is 1400 years old?
 
  • #38
angel 42 said:
hi, you are seeing a ""place"" or position of that star at some time from the past, which you all will agree with that. BUT CAN YOU BELIEVE that this was noted in a book that is 1400 years old?
A lot of guesses and sometimes just stories that in hindsight have some truth to them, but it wasn't the result of scientific research, and no, I am not surprised. We just discussed this kind of thing in another thread.
 
  • #39
angel 42 said:
BUT CAN YOU BELIEVE that this was noted in a book that is 1400 years old?

We were supposed to get this from the original question posted?

hi, can anyone of you look and see the stars, for example, can you see the sun?
kind of a puzzle
lets see what do you think

If we were, how?
 
  • #40
angel 42 said:
hi, you are seeing a ""place"" or position of that star at some time from the past, which you all will agree with that. BUT CAN YOU BELIEVE that this was noted in a book that is 1400 years old?

Are you impressed about this bit of triviality because it is ancient? Dude, here's another one: you see what you're seeing "from another place at another time". Cool, hey? Gosh, this was time well wasted...
 
  • #42
russ_watters said:
Have you seen the bridge?


I ain't seen the bridge!

Where's that confounded bridge?
 
  • #43
at least you do agree that what you see is a postion of the star...
 
  • #44
Angel_42, you're not making much sense.

By definition, "seeing" something is sensing light coming ~directly from it. Therefore when you look at the sun you're seeing the sun. You can argue that really you're only seeing photons representing the sun in the past, and this is of course true, but that's true of EVERYTHING you see.
 
  • #45
Really now...

This kind of word play is pointless and, no offense intended, the type of thing I heard from my young children.
<flash-back theme>
Son: "Can I see that toy?"
Daughter: (holding the toy in front of her brother) "There you go, you can see it!"
Son: (exasperated) "No, I want to hold it."
Daughter: "You didn't say "hold it, you said "see it"...

If someone has the ability of sight, and the weather and time are right, if you look at the sun, you see it regardless of our distance from it, or its true relative position. Whether you see the sun as it was 8 minutes ago or in some different location is not relevant to the question "Can you see the sun?" They are just modifiers to the object we call the "sun". Let's apply the same standard to a much closer object, say... a car. You and I can be standing side by side as a blue car passes in front of us. I ask, "Did you see that car?" You reply, "Yes." It would be unreasonable for me to say, "No, you saw a Blue car." The fact that sun is 8 light minutes away or that the car was blue did not change the truth that both were observed.

...and everything under the sun is in tune
but the sun is eclipsed by the moon.
 
Last edited:
  • #46
Okay, the only thing I can figure he's looking for is that because of the delay in when you see the light from the sun vs when it was emitted from the sun, when you look in the direction you see the light coming from, it's where the sun WAS when the light was emitted, not it's actual location NOW. It might be a bigger difference for more distant stars, but really fairly inconsequential for the position of the sun relative to wherever you're standing attempting to blind yourself staring at it. :rolleyes:
 
  • #47
I thought this had been locked.

Locked now.
 
Back
Top