The Andromeda galaxy is the closest giant galaxy to our Milky Way, located about 2.5 million light-years away.
At first glance, it might feel like it is reachable.
It appears that if you can travel at the speed of light, you will eventually arrive.
However, modern physics reveals a much colder reality.
Even the speed of light might not be enough.
Inspired by Richard Feynman's way of thinking, this video explores why traveling to Andromeda can be fundamentally nearly impossible, even for a highly advanced civilization.
According to Einstein's theory of relativity, objects with mass cannot reach the speed of light.
As one approaches the speed of light, the required energy increases endlessly, and our intuition regarding time and space crumbles.
But there is a bigger problem.
The universe is not static.
Space itself is expanding.
Due to dark energy, distant regions of the universe are moving further away at an increasingly faster rate over time.
Therefore, distance is not simply a fixed number.
As the universe expands, the very path we must take is changing.
Andromeda may appear to be a nearby galaxy, but the very idea of reaching it connects to the deepest problems of physics: the speed of light, time dilation, the energy limit, and the expansion of the universe.
Space travel is not simply a matter of building faster engines.
It is a battle against the very structure of reality.
In Feynman's Way, we explore the deepest principles of the universe and reality through physics. #RichardFeynman #Andromeda #Universe #Galaxy #TheoryOfRelativity #SpeedOfLight #Spacetime #CosmicExpansion #DarkEnergy #Physics #Astronomy #Cosmology #ScienceDocumentary
📚 References
Richard P. Feynman, Robert B. Leighton, Matthew Sands — The Feynman Lectures on Physics
Richard P. Feynman — Six Not-So-Easy Pieces
Richard P. Feynman — The Character of Physical Law
Albert Einstein — Relativity: The Special and the General Theory
Edwin F. Taylor, John Archibald Wheeler — Spacetime Physics
Sean Carroll — Spacetime and Geometry
Brian Greene — The Fabric of the Cosmos
Stephen Hawking — A Brief History of Time
Kip S. Thorne — Black Holes and Time Warps
NASA — Andromeda Galaxy and Cosmic Expansion Research
The Andromeda galaxy is the closest giant galaxy to our Milky Way, located about 2.5 million light-years away.
At first glance, it might feel like it is reachable.
It appears that if you can travel at the speed of light, you will eventually arrive.
However, modern physics reveals a much colder reality.
Even the speed of light might not be enough.
Inspired by Richard Feynman's way of thinking, this video explores why traveling to Andromeda can be fundamentally nearly impossible, even for a highly advanced civilization.
According to Einstein's theory of relativity, objects with mass cannot reach the speed of light.
As one approaches the speed of light, the required energy increases endlessly, and our intuition regarding time and space crumbles.
But there is a bigger problem.
The universe is not static.
Space itself is expanding.
Due to dark energy, distant regions of the universe are moving further away at an increasingly faster rate over time.
Therefore, distance is not simply a fixed number.
As the universe expands, the very path we must take is changing.
Andromeda may appear to be a nearby galaxy, but the very idea of reaching it connects to the deepest problems of physics: the speed of light, time dilation, the energy limit, and the expansion of the universe.
Space travel is not simply a matter of building faster engines.
It is a battle against the very structure of reality.
In Feynman's Way, we explore the deepest principles of the universe and reality through physics. #RichardFeynman #Andromeda #Universe #Galaxy #TheoryOfRelativity #SpeedOfLight #Spacetime #CosmicExpansion #DarkEnergy #Physics #Astronomy #Cosmology #ScienceDocumentary
📚 References
Richard P. Feynman, Robert B. Leighton, Matthew Sands — The Feynman Lectures on Physics
Richard P. Feynman — Six Not-So-Easy Pieces
Richard P. Feynman — The Character of Physical Law
Albert Einstein — Relativity: The Special and the General Theory
Edwin F. Taylor, John Archibald Wheeler — Spacetime Physics
Sean Carroll — Spacetime and Geometry
Brian Greene — The Fabric of the Cosmos
Stephen Hawking — A Brief History of Time
Kip S. Thorne — Black Holes and Time Warps
NASA — Andromeda Galaxy and Cosmic Expansion Research
하지만 상대성 이론과 우주적 시간의 관점에서 볼 때 다음 두 가지 중 하나의 상황이 벌어집니다.
지구의 시계는 그대로 흘러간다 (절대 시간 관점): 내가 빛보다 수억 배 빠른 초광속으로 우주를 왕복하는 동안, 지구에 남아 있는 사람들의 세상은 평범하게 흘러갑니다. 안드로메다를 다녀오는 데 지구 시간으로 편도 250만 년, 왕복 5만 년... 혹은 우주선의 가속과 감속 기술에 따라 다르겠지만, 적어도 안드로메다까지 빛이 왕복하는 물리적 시간(최소 500만 년) 동안 지구에서는 수백만 년의 세월이 훌쩍 지나가게 됩니다.
따라서 지구로 돌아왔을 때 지금 있던 친구, 가족, 인류는커녕 인류라는 종족 자체가 남아있지 않거나 지구라는 행성의 모습 자체가 완전히 변해 있을 확률이 높습니다. (수백 년이 아니라 수백만 년 단위입니다.)
빛의 속도(초속 약 30만 km)로도 250만 년이 걸리는 거리를 다녀오는 것이기 때문에, 빛보다 수억 배 빠른 가상의 기술을 쓰더라도 우주선 안의 나에게는 순식간인 시간이 지구의 시간으로는 수백만 년 뒤가 되어 돌아오게 됩니다.
따라서 지금 지구에 있는 사람들은 당연히 모두 세상을 떠났고, 역사 책에서조차 흔적을 찾기 힘든 까마득한 미래에 홀로 떨어지게 됩니다.
😅
따라서 지구로 돌아왔을 때 지금 있던 친구, 가족, 인류는커녕 인류라는 종족 자체가 남아있지 않거나 지구라는 행성의 모습 자체가 완전히 변해 있을 확률이 높습니다. (수백 년이 아니라 수백만 년 단위입니다.)
빛의 속도(초속 약 30만 km)로도 250만 년이 걸리는 거리를 다녀오는 것이기 때문에, 빛보다 수억 배 빠른 가상의 기술을 쓰더라도 우주선 안의 나에게는 순식간인 시간이 지구의 시간으로는 수백만 년 뒤가 되어 돌아오게 됩니다.
따라서 지금 지구에 있는 사람들은 당연히 모두 세상을 떠났고, 역사 책에서조차 흔적을 찾기 힘든 까마득한 미래에 홀로 떨어지게 됩니다.😂😂😂😢😢😢😢😢😢