spiral galaxy stars move through dense arms star formation

Stars move through a galaxy's spiral arms

The bright spiral arms of a galaxy are not permanent groups of the same stars. Stars move into and out of the arms. The arms are denser regions where gas is compressed and new stars are more likely to form.

Some New Zealand birds evolved without flight

With few mammalian predators, some native New Zealand birds evolved without the ability to fly. After people arrived, habitat changes and introduced mammals contributed to many bird extinctions, including the moa and Haast’s eagle.

Israel produced over half its water artificially

By 2015, more than half the water used by households, farms, and industry in Israel was artificially produced.

spiral galaxy stars move through dense arms star formation

Stars move through a galaxy's spiral arms

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