closure density

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Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)

The Seven Sacraments of the Roman Catholic church

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.

What is Holy Week?

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

closure density

cosmology

Also known as: critical density

Learn about this topic in these articles:

theoretical models in cosmology

In cosmology: Bound and unbound universes and the closure density
…criterion for the critical, or closure, density (in mass equivalent of matter and radiation) that separates closed or bound universes from open or unbound ones. If Hubble’s constant at the present epoch is denoted as H₀, then the closure density (corresponding to an Einstein–de Sitter model) equals 3H₀²/8πG, where G…
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