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When did we know other galaxies?
1924: Astronomer Edwin Hubble announces that the spiral nebula Andromeda is actually a galaxy and that the Milky Way is just one of many galaxies in the universe. Before Copernicus and Galileo, humans thought our world was the center of creation.
What is beyond the universe?
The trite answer is that both space and time were created at the big bang about 14 billion years ago, so there is nothing beyond the universe. However, much of the universe exists beyond the observable universe, which is maybe about 90 billion light years across.
How many universes are there?
In a new study, Stanford physicists Andrei Linde and Vitaly Vanchurin have calculated the number of all possible universes, coming up with an answer of 10^10^16.
- When did we know other galaxies?
- What is beyond the universe?
- How many universes are there?
- How do we know that other galaxies exist?
- How did astronomers discover other galaxies?
- Who first proved that there were galaxies outside our own?
- When did we learn about other planets?
- What is the oldest planet?
- What was the first animal on Earth?
- What was the last planet to be discovered?
- Who named the planet Earth?
- Are we getting closer to the Sun?
- What is the name of the 13th planet?
- Is Planet nine a black hole?
- How old is the Sun?
- How many planets exist?
- Which planet is most like Earth?
- Is the universe infinite?
- Is there another Earth in another galaxy?
- Is there any world under the sea?