Astronomy for Beginners
Here’s where you’ll find observing guides, how-to articles and great astronomy hints and tips. Don’t forget to also check out our comprehensive astronomy dictionary.
Debris that floats in the liquid inside the eye. A shadow is cast on the retina by floaters that can be seen in your peripheral vision. They come from detached parts of the retina.
A star with a companion that periodically passes in front of it, and eclipses it as seen from Earth.
This is the coldest temperature theoretically possible (-273.15 degrees Celsius), where the motion of atoms in a material would stop completely, leaving them only with a small amount of quantum mechanically energy.