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Originally posted by CrimsonMoon
reply to post by flexy123
I think if he was travelling at the speed of light away from the planet and looked back it would appear static and 'paused' as he is travelling at the same speed as the light from the planet.
A space ship goes from planet A in a single direction at the speed of light.
After one year travel, the space ship reached a distance of 1 light year.
Guy on the space ship takes out a telescope and points it back in the direction of planet A, where they came from.
Since planet A is seen "one year in the past" (because light from planet A needs one year to reach the space ship), the guy on the space ship can observe their own space ship launching. If he's lucky (and assuming he has a really great telescope), he can even see himself waving at himself
Correct?
Related: When we glance into space with large telescopes, such as Hubble etc, the further we look, the more distant back into time we look. Correct? Say, we point a telescope at an area where we know the area is, say, a billion light years out there, we see the light from a billion years ago.
I had an interesting thought yesterday, what if we assume that our own galaxy, at one point in the past, was at the exact same spot where we look at with a telescope today. So, we look at the spot from a billion or so years ago, and we see our OWN galaxy?
I mean, let's take the classic big bang theory which says that the universe is 13 bil years old. 13 bil years ago, all galaxies/matter was condensed at a rather small spot. (Since the universe is expanding). Correct?
So..if we look at a spot we know is "13 billion years in the past" (because it's 13 bil light years away), and we happen to see a whole bunch of cosmic matter - we need to conclude we are looking at the beginning of the universe with our own galaxy in it?
Originally posted by flexy123
A space ship goes from planet A in a single direction at the speed of light.
After one year travel, the space ship reached a distance of 1 light year.
Guy on the space ship takes out a telescope and points it back in the direction of planet A, where they came from.
Since planet A is seen "one year in the past" (because light from planet A needs one year to reach the space ship), the guy on the space ship can observe their own space ship launching. If he's lucky (and assuming he has a really great telescope), he can even see himself waving at himself
Correct?
I mean, let's take the classic big bang theory which says that the universe is 13 bil years old. 13 bil years ago, all galaxies/matter was condensed at a rather small spot. (Since the universe is expanding). Correct?
So..if we look at a spot we know is "13 billion years in the past" (because it's 13 bil light years away), and we happen to see a whole bunch of cosmic matter - we need to conclude we are looking at the beginning of the universe with our own galaxy in it?
Originally posted by flexy123
A space ship goes from planet A in a single direction at the speed of light.
After one year travel, the space ship reached a distance of 1 light year.
Guy on the space ship takes out a telescope and points it back in the direction of planet A, where they came from.
Since planet A is seen "one year in the past" (because light from planet A needs one year to reach the space ship), the guy on the space ship can observe their own space ship launching. If he's lucky (and assuming he has a really great telescope), he can even see himself waving at himself
Correct?
Related: When we glance into space with large telescopes, such as Hubble etc, the further we look, the more distant back into time we look. Correct? Say, we point a telescope at an area where we know the area is, say, a billion light years out there, we see the light from a billion years ago.
I had an interesting thought yesterday, what if we assume that our own galaxy, at one point in the past, was at the exact same spot where we look at with a telescope today. So, we look at the spot from a billion or so years ago, and we see our OWN galaxy?
I mean, let's take the classic big bang theory which says that the universe is 13 bil years old. 13 bil years ago, all galaxies/matter was condensed at a rather small spot. (Since the universe is expanding). Correct?
So..if we look at a spot we know is "13 billion years in the past" (because it's 13 bil light years away), and we happen to see a whole bunch of cosmic matter - we need to conclude we are looking at the beginning of the universe with our own galaxy in it?
I had an interesting thought yesterday, what if we assume that our own galaxy, at one point in the past, was at the exact same spot where we look at with a telescope today. So, we look at the spot from a billion or so years ago, and we see our OWN galaxy?
So..if we look at a spot we know is "13 billion years in the past" (because it's 13 bil light years away), and we happen to see a whole bunch of cosmic matter - we need to conclude we are looking at the beginning of the universe with our own galaxy in it?