Credit: Bob King

It’s Fall Again! Time For A Trip To The Celestial Equator

Cool breezes are back, and the outdoors color palette is shifting toward the red end of the spectrum. Spring begins Thursday morning (Sept. 22) at 9:21 a.m. Central Daylight time. Nice to know things will be warming up again so soon. Wait a sec. That’s the southern hemisphere. Here in the north, it’s the first…
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Aurora Sept. 19, 2016. Credit: Bob King

Aurora Right On Schedule Tonight

I’m always tickled and amazed when an aurora is forecast, and it happens exactly at the predicted time. So it was earlier tonight and may still be now. Although the waning gibbous moon is finally climbing above the horizon, I could still see a foggy greenish rainbow splayed across the northern sky in despite moonlight. This aurora,…
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Credit: ESO / L. Calcada

How Big Are Black Holes?

It’s hard to visualize a black hole because you can’t see one directly. A black hole’s gravity is so strong not even light can escape. Without light to let us know it’s there, we see only darkness, hence the name. Luckily, there are several ways to know they’re there. Black holes can be “seen” by calculating how…
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A colorful aurora photographed in early fall. Credit: Bob King

Two Days Before Fall, The Aurora May Come Knocking

It’s been a while. No northern lights in the neighborhood for a couple weeks at least. That could change tomorrow evening (Sept. 19) when the wind blowing from a solar coronal hole wafts past Earth. If the magnetic direction of that wind points south — just like the south pole of a magnet — it…
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El Gancedo unearthed! Credit: Ministerio de Gobierno, Justicia y Relación con la Comunidad

Massive “El Gancedo” Meteorite Unearthed In Argentina

Amazing what can fall out of the sky! Somewhere between 4,000 to 6,000 years ago, indigenous peoples in northern Argentina witnessed what had to be one of the most frightening apparitions of their lives. A host of massive iron meteorites plummeted to Earth and dug out craters across an area measuring 2 x 11.5 miles long (3×18.5…
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