A study by Dartmouth researchers proposes a new theory about the origin of dark matter, the mysterious and invisible ...

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 ...

Galactic megacollision: A visible-light and X-ray composite image of the Bullet cluster 1E 0657-556, which formed after the ...

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 ...

Everything we visualize about space, including stars, planets, gases, and even galaxies, make up just a small fraction of 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 ...

Primordial black holes could inhabit the modern-day cosmos, making them responsible for the phenomenon of dark matter, according to new research.

They are omnipresent yet interact extremely rarely with matter. In cosmology, they influence the formation of large-scale galaxy structures, while in particle physics, their minuscule mass serves ...

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.