galaxy collisions gas dust trigger star formation

Passing galaxies can trigger the birth of new stars

Two galaxies can pass through each other without most of their stars ever colliding because the stars are so far apart. Their clouds of gas and dust do interact, however, and the disturbance can trigger the formation of many new stars.

Mexico adopted an Aztec symbol after independence

After independence, Mexico adopted the eagle on a cactus from Aztec tradition as a national emblem. At the same time, some conservative elites rejected positive views of the country’s pre-Spanish past and opposed its living Indigenous peoples.

A faint radio hiss became evidence for the Big Bang

In 1964, radio astronomers found a faint signal coming from every direction in the sky. Its temperature was only about 3 kelvin, and it matched predictions for leftover radiation from the early universe. The mysterious hiss became major evidence for the Big Bang.

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galaxy collisions gas dust trigger star formation

Passing galaxies can trigger the birth of new stars

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