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An extraterrestrial being in galaxy B discovered galaxy A was 8 billion light years away If galaxy B is approximately 13.5 billion years old when did galaxy A emit the light that ET observes?
8 billion years ago.
When you see a galaxy 8 billion light years away you are how many years into the past?
8 billion light years means that the light has taken 8 billion years to reach you. That's how far into the past you are seeing.
When you see a galaxy 8 billion light-years away you are looking how many years into the past?
When you see a galaxy that is 8 billion light years away, the light that's dribbling into your eye left that galaxy 8 billion years ago, and has been traveling toward you ever since then. If you just happen to see the galaxy explode or turn blue while you're watching it, you'll know that it actually exploded or turned blue 8 billion years ago. Similarly, if the galaxy explodes or turns green tonight, you won't know about that for another 8 billion years from tonight.
How do astronomers observing distant galaxies talk about looking backward in time?
The speed of light is not infinite. Light takes time to travel from distant galaxies to our eyes here on Earth. If a galaxy is 1 billion light years away, it has taken 1 billion years for the light emitted by said galaxy to reach us here, so (obviously) we are seeing the light emitted 1 billion years ago. In a sense, we are seeing 1 billion years into the past at the light emitted by that galaxy.
Ten years ago astronomers found a galaxy that you know is 8 billuon light years away If the universe were now 15 billion yrs old when would the galaxy have emitted the light you observed?
8 billion years ago.
Is it the most distant dwarf galaxy when it's 13.2 billion light years from Earth?
Yes, it's the most distant dwarf galaxy 13.2 billion light-years from Earth (i.e. PCB2012 3020 in the MACS J1149+2223 galaxy cluster).
Where is the comet galaxy located?
The Comet Galaxy is about 3.2 billion light years from Earthwithin the galaxy cluster called Abell 2667.
Is it the most distant spiral galaxy when it's 10.7 billion light years from Earth?
Yes, it's the most distant spiral galaxy 10.7 billion light-years from Earth (i.e. BX442 in the Pegasus constellation).
How far is the Andromeda Galaxy?
At the current estimates, the Andromeda Galaxy is about 2.54 million light years from us, and getting closer every year. At that rate, it is expected to "merge" not "collide" in about 4.5 billion years.
Which is the further most galaxy?
The galaxy that is the farthest away is the MACS0647-JD. It is 13.3 billion light years away.
Is it the most distant dwarf galaxy when it's 13.3 billion light years from Earth?
Yes, it's the most distant dwarf galaxy 13.3 billion light-years from Earth (i.e. CZC2013 MACS0647-JD1 in the MACS J0647+7015 galaxy cluster).
How far is the Andromeda Galaxy from Earth in Light Years?
The Andromeda Galaxy is approximately 2.537 million light-years away from Earth. It is the nearest spiral galaxy to the Milky Way and is on a collision course with our galaxy, expected to merge in about 4.5 billion years.
