Disclaimer: This blog does not contain full documentation of the laboratory procedures, neither does it pretend to provide a complete lab instruction. Instead, it is designed to document special moments in the physics lab. Enjoy!
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A sunspot
Sunspots are regions on the solar surface that appear dark because they are cooler than the surrounding photosphere, typically by about 1500 K (Sunspots)
(photo done with a cellphone camera through Victor's telescope)
