| The darkest, central region of a sunspot, called the umbra, features tightly bundled magnetic field lines. |
| The strongest solar magnetic fields, up to 4000 gauss, are found within the umbra. |
| Our planet's shadow has two parts, a dark inner core called the umbra and a pale outer fringe called the penumbra. |
| The total eclipse begins when the Moon is fully inside the umbra, but it won't be completely blacked out. |
| The umbra is a central cone of darkness which tapers away from the Earth or Moon. |
| If you were in a spaceship and you passed through the Earth's umbra you would not be able to see any part of the Sun. |
