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How will the world end? Professor Brian Cox explains that in about 4 billion years, the sun will run out of fuel, swell up, and incinerate the Earth. As if that wasn't enough, the Andromeda Galaxy is also on a collision course with us at roughly the same time.

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Cosmos Archive

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31,907 görüntüleme • 6 ay önce •via X (Twitter)

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Every time you look at the stars, you are literally looking back in time. As Professor Brian Cox explains, because light takes time to travel through the vastness of space, we see the Andromeda Galaxy not as it is today, but as it was 2 million years ago. This means that if we look deep enough into the cosmos, we can actually see the oldest light in existence—the Cosmic Microwave Background Radiation—a glowing echo that began its journey 13.8 billion years ago, right at the very dawn of the universe.
0:40

Every time you look at the stars, you are literally looking back in time. As Professor Brian Cox explains, because light takes time to travel through the vastness of space, we see the Andromeda Galaxy not as it is today, but as it was 2 million years ago. This means that if we look deep enough into the cosmos, we can actually see the oldest light in existence—the Cosmic Microwave Background Radiation—a glowing echo that began its journey 13.8 billion years ago, right at the very dawn of the universe.

Cosmos Archive

21,599 görüntüleme • 4 ay önce

Brian Cox is pointing at one dot. The dot is a galaxy with 100 billion stars. There are 200 billion more on the same map. The thin line at the top of that map represents a billion light-years. At the speed of light, it would take a billion years to cross that sliver. The math gets stranger. The observable universe holds roughly 30 sextillion stars. Every grain of sand on every beach on Earth combined is about 7.5 sextillion. The universe has 4x more stars than Earth has sand. The deeper number is which of those galaxies you can ever actually reach. Dark energy is accelerating cosmic expansion. Space itself is stretching faster than light can cross it. The cosmic event horizon sits at roughly 16 billion light-years from Earth. Anything past that is moving away from us faster than light can chase. We can see those galaxies because their photons left billions of years ago when the gap was small enough. We cannot reach them. We cannot send a signal. We cannot know what they look like now. 97% of the galaxies on Cox's map are already disconnected from our future. Visible artifacts of a past that has ended. Now look forward. In about 150 billion years, accelerating redshift will push every galaxy outside our Local Group beyond detection. Andromeda will have merged with the Milky Way. The other 199,999,999,999 galaxies will be invisible. Civilizations on planets around future stars will look up and see only one galaxy. Their telescopes will tell them the universe ends at the edge of the Local Group. They will not see cosmic background radiation. They will not observe expansion. They will not know about the Big Bang. The evidence will have receded past their light cone. Every astronomy textbook they could ever write would conclude the universe is small, static, and made of one galaxy. We exist in a 100-billion-year window where the universe is still legible. Before us, too hot, too dense, too young. After us, the lights go out one galaxy at a time. 30 sextillion stars on the map. A 100-billion-year window in which to read it. We exist inside the only overlap.
0:53

Brian Cox is pointing at one dot. The dot is a galaxy with 100 billion stars. There are 200 billion more on the same map. The thin line at the top of that map represents a billion light-years. At the speed of light, it would take a billion years to cross that sliver. The math gets stranger. The observable universe holds roughly 30 sextillion stars. Every grain of sand on every beach on Earth combined is about 7.5 sextillion. The universe has 4x more stars than Earth has sand. The deeper number is which of those galaxies you can ever actually reach. Dark energy is accelerating cosmic expansion. Space itself is stretching faster than light can cross it. The cosmic event horizon sits at roughly 16 billion light-years from Earth. Anything past that is moving away from us faster than light can chase. We can see those galaxies because their photons left billions of years ago when the gap was small enough. We cannot reach them. We cannot send a signal. We cannot know what they look like now. 97% of the galaxies on Cox's map are already disconnected from our future. Visible artifacts of a past that has ended. Now look forward. In about 150 billion years, accelerating redshift will push every galaxy outside our Local Group beyond detection. Andromeda will have merged with the Milky Way. The other 199,999,999,999 galaxies will be invisible. Civilizations on planets around future stars will look up and see only one galaxy. Their telescopes will tell them the universe ends at the edge of the Local Group. They will not see cosmic background radiation. They will not observe expansion. They will not know about the Big Bang. The evidence will have receded past their light cone. Every astronomy textbook they could ever write would conclude the universe is small, static, and made of one galaxy. We exist in a 100-billion-year window where the universe is still legible. Before us, too hot, too dense, too young. After us, the lights go out one galaxy at a time. 30 sextillion stars on the map. A 100-billion-year window in which to read it. We exist inside the only overlap.

Aakash Gupta

53,238 görüntüleme • 4 ay önce

Earth orbits the Sun, and the Sun orbits the center of the galaxy... but what is the Milky Way itself orbiting? The Milky Way is not orbiting a single object. Instead, it is moving around a shared center of mass alongside the Andromeda galaxy. While most of the universe is being pushed apart by dark energy, the gravity within our "Local Group" is strong enough to pull these two galaxies toward each other in a slow "cosmic dance." This movement isn't a clean, circular orbit; it is a direct path toward a massive collision and merger that will occur in about 4 to 5 billion years.
1:21

Earth orbits the Sun, and the Sun orbits the center of the galaxy... but what is the Milky Way itself orbiting? The Milky Way is not orbiting a single object. Instead, it is moving around a shared center of mass alongside the Andromeda galaxy. While most of the universe is being pushed apart by dark energy, the gravity within our "Local Group" is strong enough to pull these two galaxies toward each other in a slow "cosmic dance." This movement isn't a clean, circular orbit; it is a direct path toward a massive collision and merger that will occur in about 4 to 5 billion years.

Cosmos Archive

47,683 görüntüleme • 6 ay önce

Here is how the merger of the Milky Way and Andromeda galaxies would appear to an observer on Earth! An artist's impression 🌀 When the collision begins (in approximately 4.5 billion years), we will see the nearby Andromeda galaxy looking much like the band of the Milky Way. Gradually, their brightness will increase due to the interaction of nebulae, the birth of bright, massive stars, and supernova explosions.
0:31

Here is how the merger of the Milky Way and Andromeda galaxies would appear to an observer on Earth! An artist's impression 🌀 When the collision begins (in approximately 4.5 billion years), we will see the nearby Andromeda galaxy looking much like the band of the Milky Way. Gradually, their brightness will increase due to the interaction of nebulae, the birth of bright, massive stars, and supernova explosions.

Black Hole

28,302 görüntüleme • 14 gün önce

In 4 billion years, the night sky will look like this. Right now, the Andromeda galaxy is hurtling toward us at 250,000 miles per hour. When it arrives, our sky will be filled with the glow of two trillion stars merging into one. A galactic dance on a scale we can barely imagine. We were born 4 billion years too early for the greatest show in the universe. ✨🌌 [new simulations suggest a 50/50 chance of a direct collision within the next 10 billion years]
0:42

In 4 billion years, the night sky will look like this. Right now, the Andromeda galaxy is hurtling toward us at 250,000 miles per hour. When it arrives, our sky will be filled with the glow of two trillion stars merging into one. A galactic dance on a scale we can barely imagine. We were born 4 billion years too early for the greatest show in the universe. ✨🌌 [new simulations suggest a 50/50 chance of a direct collision within the next 10 billion years]

Curiosity

110,428 görüntüleme • 4 ay önce

Finding alien life wouldn't be terrifying. It would be a profound relief. As Professor Brian Cox explains, the thought that keeps him awake at night is the possibility that complex life is so incredibly rare that Earth might be the only inhabited planet in the entire Milky Way galaxy. If we are truly alone, it means that if humanity destroys our world, we aren't just ending our own story. We could be permanently extinguishing all intelligence and meaning in a galaxy of 400 billion stars; a terrifying cosmic burden that he hopes we do not have to carry by ourselves.
0:47

Finding alien life wouldn't be terrifying. It would be a profound relief. As Professor Brian Cox explains, the thought that keeps him awake at night is the possibility that complex life is so incredibly rare that Earth might be the only inhabited planet in the entire Milky Way galaxy. If we are truly alone, it means that if humanity destroys our world, we aren't just ending our own story. We could be permanently extinguishing all intelligence and meaning in a galaxy of 400 billion stars; a terrifying cosmic burden that he hopes we do not have to carry by ourselves.

Cosmos Archive

14,898 görüntüleme • 4 ay önce

Elon Musk: In half a billion years, the sun will expand and make life impossible on Earth. “The universe appears to be 13.8 billion years old. Earth is 4.5 billion years old. In another half billion years or so, the sun will expand and probably evaporate the oceans and make life impossible on Earth. Which means that if it had taken consciousness 10% longer to evolve, it would never evolve at all. Just 10% longer. I wonder how many dead one-planet civilizations there are out there in the cosmos that never made it to the other planet and ultimately extinguished themselves or were destroyed by external factors. Probably a few.” Interview with Lex Fridman, November 12, 2019
0:46

Elon Musk: In half a billion years, the sun will expand and make life impossible on Earth. “The universe appears to be 13.8 billion years old. Earth is 4.5 billion years old. In another half billion years or so, the sun will expand and probably evaporate the oceans and make life impossible on Earth. Which means that if it had taken consciousness 10% longer to evolve, it would never evolve at all. Just 10% longer. I wonder how many dead one-planet civilizations there are out there in the cosmos that never made it to the other planet and ultimately extinguished themselves or were destroyed by external factors. Probably a few.” Interview with Lex Fridman, November 12, 2019

ELON CLIPS

481,469 görüntüleme • 11 ay önce

Did you know we can see back to the dawn of time? Brian Cox explains how we’re seeing a galaxy that formed just after the Big Bang. For context, the light was more than halfway to us before Earth even existed!
0:50

Did you know we can see back to the dawn of time? Brian Cox explains how we’re seeing a galaxy that formed just after the Big Bang. For context, the light was more than halfway to us before Earth even existed!

Cosmos Archive

11,614 görüntüleme • 6 ay önce

If you’re ever sad, just remember the world is 4.543 billion years old and you somehow managed to exist at the same time as the NL POTW Will Benson.
0:44

If you’re ever sad, just remember the world is 4.543 billion years old and you somehow managed to exist at the same time as the NL POTW Will Benson.

Cincinnati Reds

67,922 görüntüleme • 1 yıl önce

Professor Brian Cox explains using a simple light clock, time is not absolute. Because the speed of light remains constant, a light beam in a moving clock traces a longer, diagonal path from an outside observer's perspective, proving that moving clocks run slower and time literally bends to the speed of the observer. This reveals a mind-bending reality: if you journeyed through space at 99.94% the speed of light for ten years, you would return to an Earth that had aged 29 years; making you a literal time traveler into the future.
2:21

Professor Brian Cox explains using a simple light clock, time is not absolute. Because the speed of light remains constant, a light beam in a moving clock traces a longer, diagonal path from an outside observer's perspective, proving that moving clocks run slower and time literally bends to the speed of the observer. This reveals a mind-bending reality: if you journeyed through space at 99.94% the speed of light for ten years, you would return to an Earth that had aged 29 years; making you a literal time traveler into the future.

Cosmos Archive

146,373 görüntüleme • 4 ay önce

Neil deGrasse Tyson explains a simple way to test whether the Earth is flat or curved. If several people stand at different heights in a tall building and watch the sunset, the people higher up will see the Sun for longer. On a flat Earth, everyone would see the sunset disappear at the same time. But because the Earth is curved, the horizon changes depending on your height — which is why the person on the roof sees the Sun last.
1:03

Neil deGrasse Tyson explains a simple way to test whether the Earth is flat or curved. If several people stand at different heights in a tall building and watch the sunset, the people higher up will see the Sun for longer. On a flat Earth, everyone would see the sunset disappear at the same time. But because the Earth is curved, the horizon changes depending on your height — which is why the person on the roof sees the Sun last.

Cosmos Archive

65,999 görüntüleme • 4 ay önce

NO WAY, Ai IS ENDING THE WORLD! 🤯 Chinese professor explains how artificial intelligence will establish a one-world government and potentially lead to the end of the world.
4:04

NO WAY, Ai IS ENDING THE WORLD! 🤯 Chinese professor explains how artificial intelligence will establish a one-world government and potentially lead to the end of the world.

JackTheRippler ©️

51,022 görüntüleme • 5 ay önce

The sun and moon out at the same time, tell me again how the earth is causing this shadow on the moon!
0:20

The sun and moon out at the same time, tell me again how the earth is causing this shadow on the moon!

FLAT OUT TRUTH

186,030 görüntüleme • 2 yıl önce

Andromeda is the nearest spiral galaxy which is 2.5 million light years away. At normal speeds, it's impossibly far. But if a spacecraft could travel at relativistic speeds (close to the speed of light), everything changes. ( 🎥 Brian Cox )
1:13

Andromeda is the nearest spiral galaxy which is 2.5 million light years away. At normal speeds, it's impossibly far. But if a spacecraft could travel at relativistic speeds (close to the speed of light), everything changes. ( 🎥 Brian Cox )

Philosophy Of Physics

48,185 görüntüleme • 6 ay önce

We are at war that declared on us 1,400 years ago and will continue until end of time There is no American Muslim, there is no Palestinian, there is no Al Qaeda It’s all one Islamic Ummah that participating in a Global Jihad and they pray 5 times a day the same prayer in every mosque around the world for victory to Islam over the disbelievers Fight against the disbelievers everywhere in the world until religion is all for Allah on the entire earth, you either Muslim or the enemy of the Muslims and they coming for you, you can’t change it, it’s divine command, if you like it or not you currently at war that start 1,400 years ago and will continue until the all world will be under the rule of Islam or they will keep trying until end of time
1:55

We are at war that declared on us 1,400 years ago and will continue until end of time There is no American Muslim, there is no Palestinian, there is no Al Qaeda It’s all one Islamic Ummah that participating in a Global Jihad and they pray 5 times a day the same prayer in every mosque around the world for victory to Islam over the disbelievers Fight against the disbelievers everywhere in the world until religion is all for Allah on the entire earth, you either Muslim or the enemy of the Muslims and they coming for you, you can’t change it, it’s divine command, if you like it or not you currently at war that start 1,400 years ago and will continue until the all world will be under the rule of Islam or they will keep trying until end of time

Bob

348,608 görüntüleme • 1 yıl önce

Earth doesn’t travel around the Sun in a perfect circle. It moves on an ellipse. At perihelion, Earth is about 91.4 million miles from the Sun. At aphelion, that distance stretches to roughly 94.5 million miles. Closest and farthest aren’t the same…and that difference shapes seasons, solar energy, and long-term planetary cycles.
1:17

Earth doesn’t travel around the Sun in a perfect circle. It moves on an ellipse. At perihelion, Earth is about 91.4 million miles from the Sun. At aphelion, that distance stretches to roughly 94.5 million miles. Closest and farthest aren’t the same…and that difference shapes seasons, solar energy, and long-term planetary cycles.

Randall Carlson

21,296 görüntüleme • 7 ay önce