But what's an atom made of? What is matter, really? Matter is defined as that which 1) has mass and 2) has volume or takes up ...

A strange energy source at the center of the Milky Way may be a new type of dark matter. Scientists found that hydrogen gas ...

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 ...

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.

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 ...

Miss Roberts: OK, so we are looking at the conservation of mass. Now, mass is the measure of how much stuff or matter is in an object and it's measured in either grams or kilograms. Katie ...