How sunlight creates a comet's coma and tail

A comet’s tail begins with sunlight

When a comet gets closer to the Sun, sunlight heats its icy surface. Frozen material turns into gas and releases dust, creating the bright cloud and tail we can see.

~773,000 years ago

Hominins were present near Casablanca

Fossils from Thomas Quarry I in Casablanca, reported in 2026, move evidence of hominins in the region back to about 773,000 years ago. The fossils are near the root of the Homo sapiens lineage, but they are identified only as hominins—not as Homo sapiens.

≈55 million people/year

Medical bills can push patients into poverty

In India, patients often must choose between free public health care with too few resources and expensive private treatment. Medical debt pushes about 55 million people into poverty each year.

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How sunlight creates a comet's coma and tail

A comet’s tail begins with sunlight

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