Four Times Over
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The US nuclear weapons arsenal is powerful enough to destroy the Earth multiple times over. The exact number of times would depend on the specific yield of each warhead and the total number of warheads available.
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.
Yes, nuclear weapons have been tested in space by several countries during the Cold War era. These tests were conducted to study the effects of nuclear explosions in space and to assess the impact of such explosions on satellites and communication systems. However, the Comprehensive Nuclear-Test-Ban Treaty (CTBT) prohibits nuclear weapon tests in any environment, including space.
Stars are massive celestial objects that are millions of miles away from Earth. While meteorites and asteroids, which are pieces of space rock, can fall to Earth, stars do not land on our planet as they are far too large and distant.
The sun's diameter is about 109 times the diameter of Earth.
Jupiter is about 11 times the diameter of Earth and over 300 times more massive. It is the largest planet in our solar system.