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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Credit: Bob King

Full Sturgeon Moon Part Two

Did you see that big moon last night? August is the time of the Full Sturgeon Moon, named for the best time to catch sturgeon in the Great Lakes. Because the moment of lunar fullness occurred this morning at 4:26 a.m., we get a full moon “spillover effect” or two nights in a row of…
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