| In
September, the Sun crosses the celestial equator and
seasons change from Summer to Fall in the north and Winter to Spring in
the southern hemisphere. Defined by the Sun's position in sky the event
is known as an equinox - the length of daylight is equal to the length of
night. |
|
The
active Sun produced the dramatic eruptive prominence seen in this extreme
ultraviolet picture from the space-based SOHO observatory. The hot plasma
is lofted above the solar surface by twisting magnetic fields. How big is
the prominence? Click on the image to view the larger full-sun picture.
At the same scale, planet Earth would likely still appear smaller than your
cursor. |
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