How is matter different from mass? These and other questions about the deepest levels of physics, answered inside.

The majority of our evidence for dark matter’s existence comes from observing visible (or baryonic) matter that does not ...

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 ...

JAMES: Because mass is about the amount of matter, whereas weight is a force and is the heaviness due to gravity. ELLIE: Exactly. So let me tell you about the equation you need to calculate the ...

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.

Stellar-mass black holes, with mass of order 10 to ... and the late universe that there must be something called dark matter (DM). This mysterious stuff dominates the matter content of the ...

Dark matter, predicted to account for most of the universe's mass, remains highly elusive. Physicists have been searching for various particles that could be promising dark matter candidates ...