Early in the 20th century, GK Persei briefly became one of the brightest stars in planet Earth’s sky, an event known as Nova Persei 1901. Popularly called the Firework Nebula, it continues to expand into space. Here is a time lapse video tracking the nebula’s expansion over the last 17 years.

Another video here shows jumping sundogs.  The current theory is that lightning discharges cause the ice crystals to temporarily re-orient themselves.

Special thanks to reader James Tiberius Root for sending in the spectacular image of the northern lights as they traveled further south than usual in late October.

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