HMS Dreadnought 1906 battleships naval arms race

HMS Dreadnought made older battleships obsolete

When the British battleship HMS Dreadnought launched in 1906, it made every existing battleship obsolete. Its launch gave Britain a technological advantage in the naval arms race that it never relinquished.

Expansion kept the early universe from becoming a black hole

The early universe was extremely dense, but it was also expanding very quickly. That expansion kept gravity from making the whole universe collapse into a black hole despite its enormous density.

Earth's magnetic field comes from moving liquid metal

Below Earth's solid surface is an outer core made of liquid iron that can carry electric current. Heat and other forces keep this metal moving. Its motion creates electric currents that keep Earth's magnetic field going.

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HMS Dreadnought 1906 battleships naval arms race

HMS Dreadnought made older battleships obsolete

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