If you've ever taken an introductory astronomy class, you've probably seen the Hertzsprung-Russell (HR) diagram. This graph ...

An ambitious project to map the density of every object in the cosmos has yielded a few surprises, and may help lead to new ...

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 heavy metal object), we say it is more dense. If something seems ...

A simulated Black Hole of ten solar masses as seen from a distance of 600km with the Milky Way in the background. Ute Kraus/Wikimedia The concept of a “black hole” is one of the most curious in ...

Density is a measure of how much mass an object has per unit volume. Density is a compound measure because mass and volume can’t be measured in the same units. Objects denser than water sink, while ...

Density is the mass per unit volume. Density can be found using this equation. Density is sometimes measured in g/cm 3. Make sure that you use units that are consistent with the question in an exam.