The Priority Mail 'Spiral Galaxy' and Priority Mail Express 'Star Cluster' stamps are now available in panes of four at post offices nationwide.

The most powerful telescope in history. The James Webb Space Telescope's "jewel-filled" photos are stunning. Marketing health foods is a multibillion-dollar business. But they may not be as wholesome as you think. Here's how to spot ultra-processed foods.

When Pagan and DePasquale first receive the images, they appear in black and white. The colors are added to the image later, as the data from the various filters are translated into the spectrum of visible light, Pagan explained. The longest wavelengths appear red, while the shorter wavelengths are blue or purple.