Students will apply tests, based on physical properties of matter samples, to determine whether a heterogeneous mixture is a suspension or a colloid. Part of science is learning how to ask questions ...

For over a century, astronomers have searched the skies for a perfect example of a phenomenon predicted by Albert Einstein: a luminous halo formed by the bending of light around a massive object. Now, ...

Eventually, as the universe expanded and cooled, these interactions slowed and then stopped, leading the dark matter to "freeze out" and remain silent in the background. While there are many ...