# NASA - Solar Cycle sASbVkK-p0w

The number of sunspots increases and decreases over time in a regular, approximately 11-year cycle, called the sunspot cycle. The exact length of the cycle can vary. It has been as short as eight years and as long as fourteen, but the number of sunspots always increases over time, and then returns to low again.\r

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- Kind: Short
- Year: 2011
- Runtime: 3 min
- By: NASA Goddard
- Genres: Space
- Archive: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:NASA_-_Solar_Cycle_sASbVkK-p0w.webm)
- Licence or status: Public domain (as the archive states it)
- Credit: NASA Goddard
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/commons/96290548?play=1)