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.

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.

Coronal mass ejection (CME)

A vast cloud of hot plasma, mainly composed of electrons and protons, that leaves the surface of the Sun.

Einstein Ring

This is a rare form of gravitational lens that occurs when a distant galaxy’s light is magnified by another galaxy directly in front of it, as seen from Earth. The result is a distorted image of a background galaxy in the shape of a perfect ring.

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