Corona aurora May 6, 2016. Credit: Bob King

Aurora Predicted Tonight But Will We See It?

A potentially bright aurora is in the forecast this evening (Oct. 13). The sun shot a CME or coronal mass ejection almost directly toward the Earth in the early morning hours of Oct. 9. After a journey of 93 million miles, the busy cloud of electrons and protons is expected to arrive this afternoon and rile our…
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ESA Medialab

Aurora Watch: A Mighty Wind Comes Our Way

Call it a gale of subatomic proportions. Once again, a gaping hole in the sun’s corona has unleashed a wind of electrons and protons bundled with magnetic energy toward the Earth. The blast touched off a minor geomagnetic storm earlier this morning with spillover expected tonight. After a lull, storming is expected to resume tomorrow morning (Sept.…
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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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