Less than the total number in existence right now ! Countries around the planet have enough nuclear warheads to destroy every living thing on earth many times over !
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It is difficult to determine an exact number of nuclear warheads needed to end all life on Earth as it would depend on various factors such as targeting and the size of the warheads. However, it is believed that even a small fraction of the world's nuclear arsenal could potentially cause catastrophic global consequences.
If the sun's nuclear reactions stopped, it would eventually cool down and no longer emit light and heat. This would have far-reaching consequences for our solar system, as all the planets rely on the sun's energy for warmth and light. Life on Earth would cease to exist without the sun's energy.
Extraterrestrial life.
If the sun never existed, Earth would not have its primary source of energy and light. This would lead to extreme cold temperatures and darkness, making life as we know it impossible to survive. The absence of the sun would also disrupt the gravitational balance in the solar system, affecting the orbits of planets and other celestial bodies.
While the Amor asteroids are considered potentially hazardous due to their orbits that can bring them close to Earth, they are not currently considered the greatest threat to life on our planet. There are other factors such as climate change, pandemics, and nuclear warfare that are considered more immediate threats to life on Earth. Efforts are being made to monitor and track these asteroids to mitigate any potential impact risks.
The sun produces energy through nuclear fusion, a process where hydrogen atoms combine to form helium, releasing vast amounts of energy. This same process serves as the basis for nuclear energy on Earth, where nuclear power plants use controlled nuclear fission reactions to generate electricity.