What causes a solar eclipse?

What causes a lunar eclipse?

During which phase of the Moon does a solar eclipse occur?

During which phase of the Moon does a lunar eclipse occur?

What is the umbra?

What is the penumbra?

A total solar eclipse is visible only from:

What type of eclipse occurs when the Moon appears reddish?

Is it safe to look directly at the sun during a solar eclipse without proper eye protection?

How often do solar eclipses occur?