You might have seen strange green and red marks on aircraft tires. They're not random -- they serve a very specific purpose and contribute to your safe flight.

Red dots on the skin can appear due to various conditions. Although people can treat some at home, other conditions may need medical attention.

The typical Little Red Dot is small, with a radius of only 2% of that of the Milky Way galaxy. Some are even smaller. As an astrophysicist who studies faraway galaxies and black holes, ...

Compact ruddy galaxies seen by the James Webb telescope confound astronomers. Having very little spin at birth may explain the galaxies’ small sizes.

The red dot that appears at the top of your Apple Watch's home face means that you have unread notifications. It'll appear whenever you have a notification, and only goes away once you check them.

Little red dots aren't bright in X-ray light, which would normally be seen from black holes. It may be, however, that gases are obscuring this form of light.