- #1
Stephanus
- 1,316
- 104
Dear PF Forum,
I have a simple and cliche question.
What is the edge of the universe?
1. We live on the surface of the earth. It's 2 dimensions against Earth 3 dimensions.
If we start from Equador which lies on the equator to the east, we'll reach Columbia then Brazil then Atlantic ocean, continue on then Congo, then Kenya, then Indian Ocean, across Maldives then, my country Indonesia (the only Asian nation in equator ) then go on to the east, Papua, then Pacific ocean, then some small islands in Pacific, continue on then we arrive back to Equador.
Does the universe look like that? 3 dimensions against 4 dimensions. So if we travel "east" from earth, we'll go back to Earth again?
2. Consider this simple drawing
B <-------- 46 gly ------------ Earth ---------------- 46gly -------------> A
If we travel east from Earth and on and on, and we reach Galaxy A, 46 giga light year "east" from eart.
What would that be?
Earth ----------------- 46 gly ------------------> A ------------------->?
Can we reach back to B?
Earth ----------------- 46 gly ------------------> A ------------------ n distance ----> B
3. Or this model
I choose 46 gly because it's the time of big bag adjusted by Hubble law.
B <-------- 46 gly ------------ Earth ---------------- 46gly -------------> A
Earth ---------------- 46gly -------------> A --------------- 46 gly -------------> C
A --------------- 46 gly -------------> C ---------------- 46gly -------------> D
C ---------------- 46gly -------------> D ---------------- 46gly -------------> E
And no end of it?
If we come up 46 gly by the age of the universe 13.8 billions light year adjusted by Hubble law,
4. Are there any galaxies beyond A to the "east"?
5. Supposed there are galaxies beyond A that we can't see. Are the distance of those galaxies still conform with Hubble law, but they are already too fast that we can't see their light?
6. If there are other galaxies beyond A to the "east", did they come from "our" big bang?
Thanks for any answer to fullfill my curiousity.
I have a simple and cliche question.
What is the edge of the universe?
1. We live on the surface of the earth. It's 2 dimensions against Earth 3 dimensions.
If we start from Equador which lies on the equator to the east, we'll reach Columbia then Brazil then Atlantic ocean, continue on then Congo, then Kenya, then Indian Ocean, across Maldives then, my country Indonesia (the only Asian nation in equator ) then go on to the east, Papua, then Pacific ocean, then some small islands in Pacific, continue on then we arrive back to Equador.
Does the universe look like that? 3 dimensions against 4 dimensions. So if we travel "east" from earth, we'll go back to Earth again?
2. Consider this simple drawing
B <-------- 46 gly ------------ Earth ---------------- 46gly -------------> A
If we travel east from Earth and on and on, and we reach Galaxy A, 46 giga light year "east" from eart.
What would that be?
Earth ----------------- 46 gly ------------------> A ------------------->?
Can we reach back to B?
Earth ----------------- 46 gly ------------------> A ------------------ n distance ----> B
3. Or this model
I choose 46 gly because it's the time of big bag adjusted by Hubble law.
B <-------- 46 gly ------------ Earth ---------------- 46gly -------------> A
Earth ---------------- 46gly -------------> A --------------- 46 gly -------------> C
A --------------- 46 gly -------------> C ---------------- 46gly -------------> D
C ---------------- 46gly -------------> D ---------------- 46gly -------------> E
And no end of it?
If we come up 46 gly by the age of the universe 13.8 billions light year adjusted by Hubble law,
4. Are there any galaxies beyond A to the "east"?
5. Supposed there are galaxies beyond A that we can't see. Are the distance of those galaxies still conform with Hubble law, but they are already too fast that we can't see their light?
6. If there are other galaxies beyond A to the "east", did they come from "our" big bang?
Thanks for any answer to fullfill my curiousity.