Stefan is writing the conclusion of his essay about solar eclipses. Which detail would be the best fit for the ending?
1. A solar eclipse happens out in space within our solar system and is visible from all locations on Earth.
2. A full solar eclipse only occurs once every hundred years. Partial eclipses happen more often, several times a year.
3. A solar eclipse is when the moon lines up perfectly between the Earth and the Sun, blocking the Sun from the Earth for several minutes.
4. A solar eclipse is an exciting rare occurrence that people look forward to. It is quite a phenomenon for the Sun to be blacked out.