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"The closest object you can see with the naked eye, the Andromeda galaxy, if you look at that about two million light years away, it means you see it as it was two million years in the past. You look at more distant galaxies, 10 million light years away, 10 million years in the past and so on. So you could ask the question, well in that case, are there objects that are so distant that the light traveling from them began its journey close to the Big Bang itself? Is that possible? And the answer is yes. And that light was first detected in the 1960s. It's called the Cosmic Microwave Background Radiation. So essentially the idea is how far can I look in every direction? You can look about 13.8 billion years into the past, back to the origin of the universe. Is that possible? And the answer is yes. "

"The closest object you can see with the naked eye, the Andromeda galaxy, if you look at that about two million light years away, it means you see it as it was…

Ideas in this flowchart

  • Observing the Universe
  • Observation of Andromeda Galaxy
  • Distant Galaxies
  • Question about Distant Objects
  • Light from Big Bang Era
  • Cosmic Microwave Background Radiation
  • Looking into the Past
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"The closest object you can see with the naked eye, the Andromeda galaxy, if you look at that about two million light years away, it means you see it as it was two million years in the past. You look at more distant galaxies, 10 million light years away, 10 million years in the past and so on. So you could ask the question, well in that case, are there objects that are so distant that the light traveling from them began its journey close to the Big Bang itself? Is that possible? And the answer is yes. And that light was first detected in the 1960s. It's called the Cosmic Microwave Background Radiation. So essentially the idea is how far can I look in every direction? You can look about 13.8 billion years into the past, back to the origin of the universe. Is that possible? And the answer is yes. "

"The closest object you can see with the naked eye, the Andromeda galaxy"

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