Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.

Which sentence from "Black Hole Beginnings" contains a cause-and-effect relationship?

More matter mounts up on the outside, increasing the pressure on the inside.

Instead it is a dramatic melding, or blending, of atoms, called nuclear fusion.

Each atom has its own tiny center, or nucleus.

Surrounding each nucleus is an electrical force field ...