With the recent oddball predictions of the end of the world from Harold Camping, and the 2012 Mayan calender ending this year, talk of the end of the world has been common. But just when will it end? Well, here we will be disregarding religious, cultural, or supernatural predictions (there are hundreds of those, we'd be here all day), and instead focusing on scientific theories, backed up by evidence and cold, hard logic.
Here are a few 'end of the world' predictions, or at least factors that could contribute to the destruction of our world:
• Stellar evolution of our sun
• Andromeda Galaxy collision
• Eventual heat death of the universe
Our Sun has a finite resource of hydrogen (the fuel needed to keep it burning), and the "evolution of stars" theory suggests that, once this reserve has been exhausted, the Sun will balloon in size and so the Earth would then only orbit at 250,000 miles from the surface of the star.
The Earth will not be consumed by the Sun itself, although most (if not all) life on the planet will perish due to the Sun's proximity, but the Earth's orbit will be disrupted heavily due to a phenomena called tidal drag, causing it to enter the Sun's expanded atmosphere.
The Earth's oceans will evaporate entirely, before the planet is finally pulled apart by gravitational forces. This will happen in approximately 7.4 billion years.
Calculations also suggest that our nearest galaxy (the Andromeda galaxy at about 2.5 million light years away) is on a crash course with our own galaxy, the Milky Way. However, even at an alarming speed of 87 miles per second, it will still take the galaxy 3 billion years to reach us.
There is no way of knowing the effect on the solar system, but it could end up in an eccentric orbit or an unwanted position, meaning that our planet will become uninhabitable.
The eventual heat death of the universe is a theory that suggests the universe will diminish to a state of no thermodynamic free energy, and will thus be unable to sustain motion or life. This is the eventual cooling down of everything in our universe. In the language of physics, the universe will have reached maximum entropy.
It is understood that the universe will reach maximum entropy after a time period much greater than the 13.4 billion years it has taken for the cosmos to get this far, so you don't have much to worry about. Yet.
Here are a few 'end of the world' predictions, or at least factors that could contribute to the destruction of our world:
• Stellar evolution of our sun
• Andromeda Galaxy collision
• Eventual heat death of the universe
Our Sun has a finite resource of hydrogen (the fuel needed to keep it burning), and the "evolution of stars" theory suggests that, once this reserve has been exhausted, the Sun will balloon in size and so the Earth would then only orbit at 250,000 miles from the surface of the star.
The Earth will not be consumed by the Sun itself, although most (if not all) life on the planet will perish due to the Sun's proximity, but the Earth's orbit will be disrupted heavily due to a phenomena called tidal drag, causing it to enter the Sun's expanded atmosphere.
The Earth's oceans will evaporate entirely, before the planet is finally pulled apart by gravitational forces. This will happen in approximately 7.4 billion years.
Calculations also suggest that our nearest galaxy (the Andromeda galaxy at about 2.5 million light years away) is on a crash course with our own galaxy, the Milky Way. However, even at an alarming speed of 87 miles per second, it will still take the galaxy 3 billion years to reach us.
There is no way of knowing the effect on the solar system, but it could end up in an eccentric orbit or an unwanted position, meaning that our planet will become uninhabitable.
The eventual heat death of the universe is a theory that suggests the universe will diminish to a state of no thermodynamic free energy, and will thus be unable to sustain motion or life. This is the eventual cooling down of everything in our universe. In the language of physics, the universe will have reached maximum entropy.
It is understood that the universe will reach maximum entropy after a time period much greater than the 13.4 billion years it has taken for the cosmos to get this far, so you don't have much to worry about. Yet.