Because mass is a property of matter, the "stuff" of the universe affected by gravity, nuclear reactions still conserve the overall mass–energy of systems. Indeed, only in nuclear physics ...

In a new study published in Physical Review Letters, scientists have estimated a new lower bound on the mass of ...

Save guides, add subjects and pick up where you left off with your BBC account. The mass of an object is how heavy it is. The amount of matter in an object is its mass. You can use the words ...

Perhaps one of the most surprising discoveries of the 20th century was that this ordinary, or baryonic, matter makes up less than 5 percent of the mass of the universe. The rest of the universe ...

Researchers have an explanation for how dark matter emerged - beginning with weightless particles and ending with massive ...

Mass balance ensures that the carbon formerly ... individual elements can vary a great deal between nonliving and living matter (Figure 5). Life on Earth depends on the recycling of essential ...

A piece of iron with the same dimensions as a piece of aluminium will be heavier because the atoms are more closely packed and each iron atom has much more mass than each aluminium atom.

In the early universe, primordial black holes could acquire a "dark charge," giving them an unnaturally long lifetime, new research suggests. This makes them an interesting candidate for dark matter.