Observing basics
流星雨
Meteor shower
Many meteors when Earth crosses a comet's dust trail.
The Perseids peak near 100 meteors per hour.
Related terms
- Light pollution — Artificial light brightening the night sky and hiding faint objects.
- Bortle scale — A 1–9 scale describing how dark a night sky is.
- Magnitude — A logarithmic brightness scale: smaller numbers are brighter.
- Limiting magnitude — The faintest magnitude visible under current conditions.