For one, scientists observe a "cosmic fossil" called the cosmic microwave background (CMB). The first light that was free to ...

To identify the planet’s most lightweight, low-density objects, 24/7 Wall St. considered first the lightest objects of their type.

“If the object has a liquid central core, then a captured PBH can absorb the liquid core, whose density is higher than the density of the outer solid layer,” Stojkovic explains.

New evidence suggests we’re living inside a giant void - The findings could explain one of the most puzzling and enduring problems in cosmology ...

Are we living in a cosmic void? New theory suggests our galaxy sits in a giant hole warping the universe's expansion.

Teaching Density Density is mass divided by volume. d=m/V or ρ=m/V But what does that mean? The simple answer is how heavy something is for its size. If something seems very heavy for its size (like a ...

“The resulting acceleration on the object depends on the so-called area-to-mass ratio, which is greater for small and light, low-density objects.” ...

It’s hard to get x-ray images of low-density materials, such as the tissues between bones, because x-rays just pass through like sunlight through a window. But what if you need to see areas that ...