Clumps of metal atoms

Clumps of metal atoms

Iron is one of the top six most abundant elements in the universe. Within a parent nebula [Parent Cloud] of a star system, there are typically large regions densely populated with metal atoms: primarily iron, with nickel and possibly trace amounts of other metal...

An infinite-mass-density singularity

Hawking and Penrose famously proved that a black hole must have a singularity in its center, such that the singularity has infinite mass density.[0] Infinite mass density [mass density = mass ÷ volume] is what happens when a point-like location [volume = 0 m³] is...
A nebula

A nebula

Nebulae are known to be places where stars are born. The image above is the Lagoon Nebula as imaged by Hubble Space Telescope. They are big clouds of atoms, atoms of different elements. Even observing nebulae that are many millions of light-years distant, we can still...