galaxy clusters intergalactic stars starlight

Many stars in a galaxy cluster can lie between the galaxies

10–50% of total starlight

In large clusters of galaxies, some stars float through the space between galaxies instead of belonging to any one galaxy. These wandering stars may produce 10–50% of all the starlight in a cluster.

Cheap printed books helped everyday languages replace Latin

Printing made books cheaper and more common, helping more people learn to read. It also made it practical to publish for people who read the languages they spoke every day. These languages gained ground in books that had once been mostly in Latin.

Bright clouds could cool the hottest side of a planet

A planet that always shows the same side to its star would have one permanently hot side. Strong heating there could create thick, bright clouds that reflect starlight back into space. This cooling could allow liquid water to survive closer to the star than expected.

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galaxy clusters intergalactic stars starlight

Many stars in a galaxy cluster can lie between the galaxies

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