What is TRUE about sunspots:
* They are cooler areas on the Sun's surface. They appear dark because they are about 1,500 degrees Celsius cooler than the surrounding photosphere.
* They are caused by intense magnetic fields. These fields suppress the flow of hot gas from the Sun's interior, leading to the cooler temperatures.
* They have a cycle of about 11 years. The number of sunspots waxes and wanes over this period, with a maximum and minimum point.
* They can impact Earth. Solar flares and coronal mass ejections, which are often associated with sunspots, can disrupt radio communications, damage satellites, and even cause power outages.
What is NOT TRUE about sunspots:
* They are always visible to the naked eye. Sunspots are only visible with the proper equipment (like a telescope with a solar filter), as looking directly at the Sun is incredibly dangerous.
Therefore, the answer to your question is: "Sunspots are always visible to the naked eye."
