The M42 nebula is the middle "star" in Orion's sword. It is actually a stellar nursery, where astronomers have observed around 700 new stars in various stages of formation. Hubble has also discovered "protoplanet" material that could be the beginnings of solar systems just like our own.

The strong force is one of the four fundamental forces in nature; the other three are gravity, electromagnetism and the weak force. It is responsible for binding together the fundamental particles of matter to form larger particles.

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