Milky Way hot gas halo missing matter

The Milky Way may hide much of its matter in hot gas

A vast halo of hot gas around the Milky Way may contain nearly as much ordinary matter as the galaxy itself. If confirmed, this gas could account for much of the galaxy’s missing ordinary matter.

Europeans once commonly slept in two shifts

In preindustrial Europe, many people slept for a few hours, woke for a period in the middle of the night, and then slept again. As artificial lighting made nighttime activity easier, this pattern faded. By the 1920s, the idea of a "first" and "second" sleep had largely disappeared.

Sandy Island stayed on maps after being declared nonexistent

Sandy Island, in the Coral Sea, was declared nonexistent after a search in the 1970s. Yet it remained in mapping datasets into the early 21st century, until its nonexistence was confirmed again in 2012.

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Milky Way hot gas halo missing matter

The Milky Way may hide much of its matter in hot gas

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